Help! I'm at my wits end

allegra

New member
Short version: all of my fish are dead and I don't know why.

Longer version: This was my FOWLR set up:
125 Uniquarium (the one with the built-in wet-dry in the back).
Sand on the bottom. About 90 lbs of live rock. I use various salt mixes, most recently for the past 8 months, Ocean Pure, which was the cheapest I can find.
I have the bio-balls in the back and a Remora hang on the back skimmer (largest model).
I have a Rio pump running the skimmer and a Rio pump for the return for the wet-dry.
I have 2 Koralia power heads for circulation. I forgot which model but they're pretty big and cost about $75 when I got them.

Ex-livestock:
Bluering angel 4-5"
Majestic angel 3-4"
Auriga butterfly 3-4"
Klein's butterfly 3-4"
2 damsels 1"
Stripey 3-4"

The tank had been set up for at least 2 years. All the fish have been in for at least 1 year. There was an ich outbreak about 6 months in and I hypo'd the tank for 3 MONTHS. It appeared to have done the trick. The fish were doing very well. I have people comment that the butterflies were the fatest they've seen. I quarantine all the fish in a separate tank for 6-8 weeks usually.

And then it happened. About 6 months ago, one by one, each fish became listless, would slow then stop eating altogether, and would die. Each took about a week to die off. Even the damsels died. There was no mass die off. The Stripey was the last to die.

During this time, I checked the ammonia, nitrite, nitrate, pH repeatedly and everything checked out. The nitrate was slightly detectable but that was it. The temperature was fine. Now, the tank is in my fish room in the garage. I have 6 other tanks in the same room, including a 60 gal reef using the same salt mix and a 40 gal "quarantine" tank now with a permanent fish. All the other tanks are fine!

Do I need some other water tests?
Does anyone have any idea??

thanx,
 
So this happened over a month or so?

Did you see any signs of flukes?

Other possible causes - A pollutant got into the tank (insecticide or soap/cleaner from your hands; stray voltage; problems with ph or oxygen levels.
 
Sounds kinda like a disease to me, possibly Flukes. You say you QT'd for "6-8 weeks usually"? 6 weeks just isn't long enough, my friend, especially with Flukes. You say everything started dying off about 6 months ago. How long before that did you add your last fish? How long did you QT?
 
well, here's the thing. After the first death, I did several large water changes, to no effect. I also treated the tank with Prazipro. Didn't work. What are the symptoms of stray voltage?
 
i'm sorry for your loss. i would probably cry if that happened to me.

from your description, it definitely sounds like a disease. it may not be ectoparasite and that's why you don't see symptoms. it could be some sort of contagious bacterial or viral infections, but it's hard to know without an autopsy to determine the COD.

this is a remote thought, but since your tank is in the garage, could someone poisonous have got into the tank and poisoned the fish? i once had a rabbit in my backyard, and one night we woke up to her squeaking. apparently she was bitten by something poisonous in the backyard and died very quickly in a few hours.
 
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