Strange Fish Deaths, Help?

snakeblitz33

Well-Known Member
Hello everyone,
In a tank that I take care of, I can't figure it out worth anything. It's a 225 gallon aquarium, two mag drive 12's and two hydor koralia 4's in it for extra flow. It gets a 10% water change once a week.
Water Parameters are as follows:
Nitrate: 20ppm
Nitrite: 0ppm
Ammonia: 0 ppm
Phosphate 0.01+-
pH: 8.3
Alk: 6 dKH
Temp: 78F
First, a 12" naso tang got ich. I took him out and treated him, he died. Then, the yellow tang wouldn't eat, the sailfin and the foxface got ich. I took them out and treated them, they got better. Then, the following week when I came back, the lawnmower blenny, the pink spotted goby, a cardinal, a strawberry pseudo, a royal gramma (I know the pseudo and gramma don't get along, but they did in this large tank.) and a couple of other fish just disappeared or died.
I put the sailfin and the foxface back in the tank. The yellow tang refused to eat and it died in my care. Then, a week later, I went back and the foxface had died and a chromis had died. The owners took the dead fish out.
I took the water parameters again:
Nitrate: ~30ppm
Nitrite: 0 ppm
Ammonia: 0 ppm
Phosphate: 0.01+-
pH: 8.2
Alk: 6dKH
Temp:76F
Salinity: 1.022
Now, understandibly, the nitrate would go up, but what would cause these fish to just... die? The only thing that I can think of now is electrical shock - but everything is on a GFCI Unit. I haven't tested with a voltmeter yet though.
Not everything died of Ich either. No, there's not a mantis shrimp because nothing new has been put in the tank for at least six months. No new rock or anything.
If anyone needs me to check any other parameters, do any testing, anything at all - let me know. I want to get this thing under control before I put some new fish in there.
Thanks everyone.
 

snakeblitz33

Well-Known Member
Anyone?
I have a EuroReef RC80 on it that pulls out a lot of gunk every week. I wash everything down each time I go to take care of the tank. The pumps are still going at full speed. There is plenty of surface agitation. I have changed out the home made carbon filter. I pulled out a well soiled piece of filter media and switched out all of the filter media being used. I left in one sponge for the biological filtration to keep going. There is live rock rubble in the sump. Detritus did form on the bottom of the aquarium but I siphon it up about twice a month and recently I added a powerhead close to the bottom of the tank to take care of the buildup. Most of the rock in the tank is actually base rock instead of live. (they don't have a FULL budget for the tank.)
I really don't understand why all of this is happening. I don't want to add any more fish until we figure out what is going on. Can anyone help?
 

alix2.0

Active Member
wow, i have no idea. only thing i can think of is that the specific gravity is a little low, but that wouldnt be killing all those fish. what else is in the tank? corals, anemones, clean up crew? even though there hasnt been any rock added for six months its still kind of possible for it to be a mantis, especially if there is a lot of rock in the tank. i doubt it though. any chance that cleaner or fumes of some kind have gotten into the water? is the tank somewhere that people would be spraying stuff, or near a kitchen or workroom? that would be my best guess.
 

snakeblitz33

Well-Known Member
It's almost adjacent to a kitchen. The bathroom that is pretty close has been painted recently, but after all of these problems. It's not possible for a mantis because the tank had been heavily copper dosed to treat ich (from the previous aquarium manager).
There is nothing in the tank other then fish, hermit crabs, base rock, a little live rock, live sand.
 

small triggers

Active Member
stray voltage, strange chemical in water or in the sink you used to clean stuff in?(did you use the same sink the painters did?) do you use RODI or tap?any additives? Fumes from acetone can lock to acrylic and posion if they come in contact with the water? Other than those posibilities I have no clue?
 

snakeblitz33

Well-Known Member
It's RO/DI top off water. I clean stuff in the sink, however it's just the skimmer cup which does not come in direct contact with the tank water.
 

rotarymagic

Active Member
I'm voting for cleaning products getting in the tank... KH is very low for my taste same with temp&SG. Why not run a phosban reactor on there and some chaeto??? testable PO4 and NO3 is foul... lol...
EDIT: or... employ the almighty turf scrubber...
 

unleashed

Active Member
well 10% isnt much water in that size tank to keep nitrates down that's only 22 gal per week being changed out.. but that wouldn't cause the fish to get ich and die.. if you are part time care taker of this tank basically for cleaning and heavy maintenance.. i would dare say that someone else is not doing something right .. not feeding properly would be my fist thought.. however if it were something that had fell into the tank normally it wouldn't take as long for each fish to parish.. but it could be something as simple as a coin or a

[hr]
or something odd fell into the tank.. this can cause devastating effects.. something to keep an eye out for before placing new fish in
 

snakeblitz33

Well-Known Member
a coin or sc-rew? Copper in coins can't leach into the water unless it's dissolved in an acid.
All the rest of the fish seem to be in good health. I am going to try and add a few new fish later this week. Any swf.com specials?
 
Originally Posted by Rotarymagic
http:///forum/post/2878053
I'm voting for cleaning products getting in the tank... KH is very low for my taste same with temp&SG. Why not run a phosban reactor on there and some chaeto??? testable PO4 and NO3 is foul... lol...
EDIT: or... employ the almighty turf scrubber...
+1 on the cleaning products....I know a person who nuked her tanks using fabreeze near them...I always cover my tanks with a plastic garbage bag when using products and open my windows...even in winter
 
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