Need help determining what's killing my fish.

T

tomthewicked

Guest
So, my tank setup is about a month old (60G high, properly cycled) and I've had about 5 fish die.
The first fish I introduced were a maroon clown, a Firefish Goby, and a hippo tang (to the tang police: I had a plan for when it outgrows the tank.). Now, I asked repeatedly at the LFS if it was a good idea to introduce all three of these fish at the same time, and she emphasized it shouldn't be an issue because of the size tank I had (again, only 60G). I took her advice and left with all three fish.
The Hippo was at the LFS for about 3 days before I brought it home. It lasted in my tank for less than 24-hours before it died. I snapped a few pictures of it and sent them to the LFS to see if they could identify the issue. They said that it likely arrived that way, but would credit me if I wanted something else.


So, about a week later I went a picked up a B&W Sabae (sp?) clown which also lasted about 24 hours. This one didn't have have the spots but had a "velvet" type coating on it shortly after it died. Because of this, I was thinking that this fish died of Marine Velvet, pure speculation on my part, but the pics I've seen of other fish confirm it. This fish however, the LFS had for about 2 months before they sold it to me. Sorry, no pics of this one.
At this point, my Maroon clown and Firefish has been in the tank for about 3 weeks, no problems. Ammonia/Nitrite/Nitrate are all 0/0/0, but sometime the nitrate gets up to 3-5 ppm, still shouldn't be a problem though.
I waited about two weeks after the B&W clown died before I introduced any new fish. Wednesday, I went back to the LFS and picked up 3 Green Chromis. One died on Friday, and the other one died just now. Both looked like they had something eating at their scales, and this looks nothing like either thing disease that killed the other two. So essentially, I think I've had three different diseases kill 4 different fish.


EDIT: The one commonality between all of these fish dying was a rapid breathing for the last few hours. All of these symptoms (the spots and heavy breathing) come on rather quickly, and then the fish dies. By rather quickly, I'm talking about a 2-4 hours. I've taken the fish out of the tanks as soon as I start to see the symptoms, but it's always too late.
All of these fish were drip acclimated for 3-4 hours in a bucket and then temperature acclimated in bags for 45 minutes.
My Current readings:
Ammonia: 0ppm
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Nitrite: 0 ppm
Nitrate: 5 ppm
PH: 8.3
Temp: 79.4F
In the tank currently:
4 Turban snails
4 Astrea snails
2 Peppermint Shrimp
1 Sandsifting star
5 red dwarf hermits
Maroon Clown
Firefish Goby
Chromis
Diatoms everywhere (just started full-time lighting)
I know that strings of bad luck exist in this hobby, but I can't help but think it's something I've doing wrong. Hopefully I've given you all enough info to tell me what it is.
Thanks
 

beth

Administrator
Staff member
The LFS was wrong to ok putting several fish in to a tank that is only 1 month old.
Also, hippo tangs are inappropriate for a tank that small. These fish need 100gal+ because they need the swimming space. Unless the hippo was 1-2" juvenile, then it was too big for this system.
Sounds like the chromis died from harassment from the dominate chromis. Pretty common.
I would not add any more fish for now. Let your system break in a bit.
If you want a good project to work on, then I would highly recommend establishing a quarantine tank to be used for isolating new fish before they go into the new tank. Good quarantine practices will result in avoiding most fish maladies from introduction in to the aquaria.
 
T

tomthewicked

Guest
Thanks for the response Beth.
Yes, the Tang was only about 1" and I had a plan to give it to a friend with a 200G when it outgrew my tank. Do you have an idea what killed the Tang by looking at the pictures? Do you think it was stress induced?
About the Chromis, would a single chromis have killed two others? Is that what the discoloring on the scales is? Any chance you think the maroon clown could be the culprit?
Thanks again!
 

beth

Administrator
Staff member
Hard to say what was wrong with this post-mortem. He looks like he had a chunk of scales taken out of him next to the gill. May have succumbed to harassment.
Yes, the largest chromis frequently will harass the others to death.
 

reefr

Member
Quote:
Originally Posted by Beth http:///t/393750/need-help-determining-whats-killing-my-fish#post_3503480
Hard to say what was wrong with this post-mortem. He looks like he had a chunk of scales taken out of him next to the gill. May have succumbed to harassment.
Yes, the largest chromis frequently will harass the others to death.
unless you have an established harem/school.
I had 6 about 8 months ago, but after 1 month, 4 remained. Those four are still with me, not fighting at all.
 

beth

Administrator
Staff member
Agree. Chromis are schooling fish, but there will be causalities in attempting to establish that school in the aquarium.
 
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