Freshwater Massive Die Off

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bradss

Jack Dempsey
MFK Member
Aug 5, 2007
19
0
31
Chicago
Hey Everyone... really need some help on this one. I have six tanks in my office of freshwater fish. Recently, just started cycling my largest tank (380 gallons) with a couple goldfish. After that I put about 20 angels in the tank. About a week and a half ago I got about 60 new fish (non-agressive - tetras/angels/geo pals) and put them in the big tank and moved my goldfish back to my large goldfish tank (150 gallon) after a few days. I also bought one dogfish? and put it in with my four large discus tank (60 gallons). Well, hell has broke loose.
Almost daily fish are dying in my 380 tank with all the angels now gone and 3-4 fish dying daily. Don't see evidence of ich. The discus are now all dead as of yesterday in their tank with only the dogfish alive. In my goldfish tank a large goldfish became paralyzed in a boomerang position and died after two days. Now, one of my LARGE plecos is hovering near the top of the tank in a slightly boomerang angle- dying. What is happening?! PH is high and trying to lower (8.0) and Nitrate is 40 - all else is OK. I have done water changes/added Melafix and Amquel +. Could this be TB? Please help...
 
I am terribly sorry about your loss. I have never heard of such a pandemic. My only thought of why it happened is too many fish too soon. Way too much fish poop at one time. And maybe the discus were picked on by the dogfish.
 
I agree it was too much fish but I think some disease is being spread to the other tanks. The dogfish wasn't bothering the discus at all and there was no new fish put in with my large goldfish/plecos EXCEPT the goldfish that I moved back from my big tank. My two other tanks aren't having die offs.
 
Yea too much at a time. And ur dogfish may of had a parasite
 
A little bit more information... I completely agree about too many fish despite the small size of the fish and large tank size BUT the goldfish cycled the tank for three weeks and then 20 baby angels for two weeks before the now massive die off. The deaths happened instantly and the spreading to the other tanks suggests some other problem. Any other ideas?
 
try looking this up in diagnostics about the boomerang swimming fish. unless its completely related. maybe the goldfish yeilded to the toxic nitrate level right before you took him out and you where just looking at the same one...

idk what a dogfish is... theres a hundred fish named dog fish on google and most of them are jokes.. sci. name ??

people advise against it, but you should do a 50% w/c to one of your already established tanks, but add that water to your 380. thats almost better than cycling because your incoming water is already cycled with plenty of BB.

and nitrate is sapposed to be at/near 0 not 40? but u know thats the reason your fish are all dying.
 
Sorry... the fish is a lungfish NOT a dogfish. My error. Any ideas on how to lower the Nitrate besides Amquel Plus?
 
it will only lower once the BB (beneficial bacteria) population is equalized with it and feeding off of it

so just do as i said before and it should be good. provided the tank you use to pour water into your 380 is already of a good water quality/ BB established.
 
it was probably the ammonia spike...i lost an oscar and a convict to ammonia poisoning a few days apart. Check ur parameters and see what is going on. GL
 
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