Emerald crab ate my fish..

jrse7en

Member
Was the fish alive or dead when he got to him? The fish didnt show any signs of disease and was looking happy eating pods. Today I came home from work and couldn't find my fish. I took tests to see if there was ammonia and possibly a dead fish. No ammonia but I saw the emerald devouring my fish. The spot I found him was right near where the fish sleeps.
On defense of the crab the fish wasn't a very active swimmer. He pretty much stayed in the same spot all of teh time and ate pods off of the glass.
Should I lose the Emerald crab?
I have been feeding them frozen, brine, mysis, pellet, and flake foods 2 times a day and let the food sit on the bottom for a bit before it got filtered away.
I'm hesitant to add more fish if I have an evil Emerald but I have no proof of the incident.
How much do I need to feed these guys to prevent them from eating other inhabitants?
 

dingus890

Member
What kind of fish was it? The fish could have had a bacterial infection or an internal disease that shows no external signs. Emerald crabs do not usually attack fish as they normally just eat algae.
I think what may of happened is the fish died and the crab which is a big part of the cleanup crew was doing his job.
Sorry for your loss :(
 

jrse7en

Member
dingus890;3171630 said:
What kind of fish was it? The fish could have had a bacterial infection or an internal disease that shows no external signs. Emerald crabs do not usually attack fish as they normally just eat algae.
I think what may of happened is the fish died and the crab which is a big part of the cleanup crew was doing his job.
My chromis could have been sick sure since 4 others died from what I believe was a bacterial infection. This guy lived in my tank for a few weeks and ate lots of pods. I lost my diatom phase and am now in the green algae phase. My tank looks so lifeless now no one wants the green algae.
WHat kind of fish can I buy in the supermarket that these guys will go for?
I think i'm not feeding them enough since I have no fish.
I'm trying to hold off on fish because they all died.
I lost a couple small hermits and a couple snails.
When I got home one of my peppermints came out to see me maybe for some food then went back to his hiding spot.
I think these guys are looking for some bigger chunks of something fresh. I need to be pointed in the right direction please.
 
S

shrimpy brains

Guest
Sorry about your fish. The first thing you need to do is find out what is killig your critters. How long has this tank been set up? What are your parameters? I know you said no ammonia, but what about nitrates, nitrites, salinity, ph, phosphates and temp??
You can buy any fresh seafood, uncooked with no additives. (shrimp, scallops, etc.) but it sounds to me as you may be overfeeding.
Also, I doubt seriously that your emerald ate our fish before it was dead.
 

jrse7en

Member
Originally Posted by Shrimpy Brains
http:///forum/post/3171647
Sorry about your fish. The first thing you need to do is find out what is killig your critters. How long has this tank been set up? What are your parameters? I know you said no ammonia, but what about nitrates, nitrites, salinity, ph, phosphates and temp??
You can buy any fresh seafood, uncooked with no additives. (shrimp, scallops, etc.) but it sounds to me as you may be overfeeding.
Also, I doubt seriously that your emerald ate our fish before it was dead.
I know i'm trying to figure it all out but all of my tests are good.
PH=8.2
78 degrees
No Ammonia
No Nitrite
Nitrate=between 5 and 10
Alkalinity is high buffer capacity
Calcium=500 ppm
No Phosphates
I'm shocked I just don't see anyone eating this green algae. They were all nuts over the diatoms but no one likes the green stuff. Im defrosting some marine cuisine, i'll watch the reaction.
What are signs of overfeeding, my water is pretty clear at this point. I don't see any uneaten food anywhere.

I have to be doing something wrong but i'm not sure what it is..
 

calbert0

Member
I had a large emerald crab that went CRAZY.
It attacked the pectoral fins on my lionfish whenever it came to rest on the rocks.
It also took the tentacles off of a RBT anemone.
Beware of the emeralds....
 

jrse7en

Member
I'm gonna go to wegmans tommorrow and buy a few small pieces of fresh fish. Are there any types of seafood to stay away from?
 
S

shrimpy brains

Guest
Generally, excessive feeding will cause high nitrates and algae problems. Of course that doesn't mean that you are overfeeding or that it is why you have algae problems, but it is a possibility. I don't feed more than my fish can consume in a few minutes. If I feel the need I may add the same amount again. I also only feed my reef tank once daily, but there are many who feed more often and don't have issues. It depends upon your inhabitants.
Also, maybe emeralds can be killers, I have never seen nor heard of it before Since you lost 4 other fish to bacterial infection, I would still say that was the problem. What, if any, fish do you currently have?? Do they seem healthy??
 
Originally Posted by Jrse7en
http:///forum/post/3171654
I know i'm trying to figure it all out but all of my tests are good.
PH=8.2
78 degrees
No Ammonia
No Nitrite
Nitrate=between 5 and 10
Alkalinity is high buffer capacity
Calcium=500 ppm
No Phosphates
I'm shocked I just don't see anyone eating this green algae. They were all nuts over the diatoms but no one likes the green stuff. Im defrosting some marine cuisine, i'll watch the reaction.
What are signs of overfeeding, my water is pretty clear at this point. I don't see any uneaten food anywhere.

I have to be doing something wrong but i'm not sure what it is..
I think you might have added the fish in your tank too soon. A new tank is stressful on fish. Your parameters can crash at any moment then return back to normal in the same day. Fish also gets Ich easy at this time. Which makes them lay at the bottom, or hide. Most people wait a long time before adding fish. I waited two months to cycle my 16 gl bowfront before putting a clean up crew in. Then three months before clownfish. The algae will go away by reducing the food, and lighting cycle. What size is you tank?
 

flower

Well-Known Member

Algae is sign of a healthy tank...a lawnmower blenny will eat green algae. If you have a large tank, a Kole tang to help him.
Have you been getting all your fish from the same place? There is a ***** by my house with nothing but sick fish. I never by fish from them, they always die.
Also what kind of fish died that sat in one spot and ate pods? A tank as young as yours does not have allot of pods, and if that is all your fish ate it starved to death.
 

ophiura

Active Member
It is true that algae is natural and normal, but not all algae, or all amounts of algae are signs of a healthy tank, IMO. Some is a sign of a real problem.
IMO, in most tanks with "healthy" growth of algae, a fish is not needed to eat it and keep it in control.
I have been feeding them frozen, brine, mysis, pellet, and flake foods 2 times a day and let the food sit on the bottom for a bit before it got filtered away.
This, IMO, is a concern. It is not "filtered away' it is just trapped in sponges or filter pads and rots. Twice a day is quite a lot for most tanks. What filtration do you have? What fish do you have? How big is the tank?
It is a real problem if most things die, and so clearly there is an issue that we can hopefully resolve :( can you post a picture?
 

jrse7en

Member
Originally Posted by Shrimpy Brains
http:///forum/post/3171705
Generally, excessive feeding will cause high nitrates and algae problems. Of course that doesn't mean that you are overfeeding or that it is why you have algae problems, but it is a possibility. I don't feed more than my fish can consume in a few minutes. If I feel the need I may add the same amount again. I also only feed my reef tank once daily, but there are many who feed more often and don't have issues. It depends upon your inhabitants.
Also, maybe emeralds can be killers, I have never seen nor heard of it before Since you lost 4 other fish to bacterial infection, I would still say that was the problem. What, if any, fish do you currently have?? Do they seem healthy??
I have no more fish just snails, hermits, shrimp, and crabs. I'm staying away from fish because I lost so many so fast. I think my emerald is interested in my cbs shrimp right now I have to get to the store and get them food they will eat.
 

jrse7en

Member
Originally Posted by Flower
http:///forum/post/3171834

Algae is sign of a healthy tank...a lawnmower blenny will eat green algae. If you have a large tank, a Kole tang to help him.
Have you been getting all your fish from the same place? There is a ***** by my house with nothing but sick fish. I never by fish from them, they always die.
Also what kind of fish died that sat in one spot and ate pods? A tank as young as yours does not have allot of pods, and if that is all your fish ate it starved to death.
My chromis ate that pods and that is 100% false my tank was littered in red pods and white pods. I have a refugium. They are all over the walls and the sand.
I only had 5 fish ever, they all died days apart. 55g.
 

jrse7en

Member
Originally Posted by ophiura
http:///forum/post/3171955
It is true that algae is natural and normal, but not all algae, or all amounts of algae are signs of a healthy tank, IMO. Some is a sign of a real problem.
IMO, in most tanks with "healthy" growth of algae, a fish is not needed to eat it and keep it in control.
This, IMO, is a concern. It is not "filtered away' it is just trapped in sponges or filter pads and rots. Twice a day is quite a lot for most tanks. What filtration do you have? What fish do you have? How big is the tank?
It is a real problem if most things die, and so clearly there is an issue that we can hopefully resolve :( can you post a picture?
I have a vertex in-100 skimmer, refugium 10g and rena filstar x3, 55g tank. The filtration seems to be excellent as there is never any food or anything on the bottom unless I turn the power off. I don't know what to do at this point.
I do not know how to post a picture because I don't have hosting accounts.
 

ophiura

Active Member
Originally Posted by Jrse7en
http:///forum/post/3171970
I have a vertex in-100 skimmer, refugium 10g and rena filstar x3, 55g tank. The filtration seems to be excellent as there is never any food or anything on the bottom unless I turn the power off. I don't know what to do at this point.
I do not know how to post a picture because I don't have hosting accounts.
What maintenance do you do on your filter? And filter sponges? It may get sucked into the filter but their it will rot and create nitrates. The nitrate issue can be worse than you think, both in terms of the actual test kit and because the algae use it before it is measured. Do you have a phosphate reading?
What is your water change schedule? Do you use tap water?
IMO, the emerald was more likely eating a dead fish, rather than killing it.
What type of fish have you tried to keep? Have any lived? Over what period of time have you been trying? Are they all from the same store? How did you acclimate them?
It is definitely not normal to lose so many fish :(
 

jrse7en

Member
Originally Posted by ophiura
http:///forum/post/3171986
What maintenance do you do on your filter? And filter sponges? It may get sucked into the filter but their it will rot and create nitrates. The nitrate issue can be worse than you think, both in terms of the actual test kit and because the algae use it before it is measured. Do you have a phosphate reading?
What is your water change schedule? Do you use tap water?
IMO, the emerald was more likely eating a dead fish, rather than killing it.
What type of fish have you tried to keep? Have any lived? Over what period of time have you been trying? Are they all from the same store? How did you acclimate them?
It is definitely not normal to lose so many fish :(
Ok well I took the Emerald back to the store last night because when I got home <from the lfs> I saw him go after my shrimp. He tried to make a move at him as if he was going to attack. I quickly pulled up the rocks, pulled him out and off he went to the store. The other emerald is doing good still eating algae and acting like a normal Emerald crab. Everyone else in the tank is doing well. I did a 10g water change today and all readings were as usual.
I have seen PH fluctuate a little and have been reading up on how to maintain the level.
I have a low phosphate lvl, I use api test kits.
I use RO water.
The only fish I ever had were those 5. 3 died in a matter of a week, 1 died about 10 days later and the last died the other day. I didn't look at each one when I bought them but the ones in the store didn't look healthy at all. I went back yesterday and 4 were in the tank dead. Some had red scratches and infections. I know that 3 died from bacterial infections because I could see the internal bleeding in them. The 4th one must have got sick or scared because he was healthy looking when I got him then his health declined and finally passed. I didn't see any diseases or abnormalities in him except he had no appetite and was hiding. The last one was shy but he ate alot.
These were my first fish after the tank cycled.
I have invertebrates now that seem to be doing ok. I have a sand sifting star which I wont keep for very long but he is doing a good job maintaining the sandbed. I spot feed him to make sure he is getting food ok. My coral banded shrimp is doing well and has molted 2 times already. Peppermint shrimps are doing OK also and I found 2 molts from them too. Nass snails are doing well but I lost a couple astrae and cerith snails. I have some hermits too which seem to be doing ok but a couple died.
I'm a little unsure about gettign another fish or getting a coral because I don't want it to die so i'm hesitant to get anything else until my fear goes away. The green algae seems to be declining slowly but I don't have any noticeable growth of coraline. My calcium and kh lvls are high. I'm not adding any additives because the calcium is already high. The water seems to be much much cleared then it was a week or two ago. I turned down the powerheads and cleaned the canister a couple times already and cut back a little on feedings. The temperature seems to stay between 76 and 78 degrees. 76 in the morning and 78 after halides have been on all day.
I acclimate pretty much everything with drip method. I haven't ever just dumped anything in.
 
S

shrimpy brains

Guest
Ok, sounds like yo just got some sick fish. I would leave the tank fishless for 6 weeks, incase they had a parasite. It should die off by then cause it will have nothing to feed on.
I recommend you don't go back to that fish store. I also recommend you get a qt. Do some research and pick out 1 or 2 hardy fish that you will want to keep long term. QT those fish for 6 weeks, then add to tank (if they still seem healthy) and see what happens. Good luck!
 

jrse7en

Member
Originally Posted by Shrimpy Brains
http:///forum/post/3172795
Ok, sounds like yo just got some sick fish. I would leave the tank fishless for 6 weeks, incase they had a parasite. It should die off by then cause it will have nothing to feed on.
I recommend you don't go back to that fish store. I also recommend you get a qt. Do some research and pick out 1 or 2 hardy fish that you will want to keep long term. QT those fish for 6 weeks, then add to tank (if they still seem healthy) and see what happens. Good luck!
I won't add any fish for a few weeks because whatever I get will be QT'd. I have a 10g but needs some sort of decorations and hiding spots. So far I have had good luck and am impressed with getting animals off the internet. They seem healthy and well taken care of, plus theres a guarantee.
 
Top