new to asking ?s I' have a few tanks, the 90gal is the problem. Fish die overnight a few still alive. The one alive act like there is no problem at all. All test check perfect. The tank has been running for years. Same thing happened 6 months ago, some fish died overnight, other were fine. Changed carbon water changes,tested water was perfect added a few new fish.Fine for 3 months, than it happened again.I have about 5 urchins,12 snails, they are fine same as last time fine.I have 365 gallon canister filter, 2 500gal powerheads and a bio wheel 250 gals.The fish lost were acting like they couldn't get enough air.Added a AQUEON 90GAL 400 gal, for a ninety gal tank,just in case today. Been keeping saltwater tanks for 40 years its got me lost. The other tanks are in the same room no problem. No sprays or ick all are fine Help THANK YOU FOR ANY IDEAS
FISH DIE OVERNIGHT
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HotRocks
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Any chance someone used some cleaning supplies near the tank or anything like that?
When you say the fish seemed short of oxygen what was the behavior? Swimming into powerheads or anything?
What type of fish were lost and what kind remain?
Have you checked ammonia?
When you say the fish seemed short of oxygen what was the behavior? Swimming into powerheads or anything?
What type of fish were lost and what kind remain?
Have you checked ammonia?
4 fish died 2 damsels a file fish a small tang . ammonia zero and have have a reef tank next to it, that ok check all test all were fine. I don't spray anything around tanks. 3 wrasse were ok when the light went now. They ate today and act like nothing was wrong. Lights on 10 hours a day, just turned off. LOST DAMSEL TODAY,AND OTHER WAS DIED THIS MOURING. THANK YOU IT HAS ME LOST.THANKS FOR FAST REPLEY ALWAYS HELP
Welcome to R2R!! Have you added anything to your tank recently? Any signs of illness on the fish that died?
HotRocks
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Any new corals or inverts added to the tank in the last 30 days?
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Do a close inspection on the fish and look for lesions. Look closely at the fins and operculums of the surviving fish. Damsels are pretty hardy. I had a damsel tank a long time ago, it was awesome, but it was the thunderdome. I doubt fish aggression would kill multiple in one night but you never know. Check the living damsel's bed for a shank. Otherwise check your water. I have never used canisters, but it sounds like you have plenty of filtration. I have read that late maintenence on a canister can cause some release of bad things. Toxin is possible but it is not clear why some survived unless they were box fish (wrasses seem to give a lot people problems). Overall, you need a closer inspection. Check the dead animals, under a dissecting scope if you have one (order one if you don't), and check all water parameters. If that does not check out check your tank for loose electrical current. I have hear about that causing problems when something shorts out. Hopefully with more info someone will be able to give you a clue.
water checks perfect,the fish ,snail, urchins have been in the tank about 4 months, nothing new. The few fish that live seem to be doing ok. snails and urchins are never bothered. Same thing happened 4 months ago.Not going to get anything new soon, just worried about the next time. Hate to loose any fish,that always seems bad even the cheaper fish. But looking in a 90gal tank almost empty,kinda stings. 40 years keeping fish and I'm lost. I thought I seen it all,but its a challenge. Still worth it,had most fish live 10 years,still family . Thank you for all the help this is a great site, always learning
just died not a mark on them,did'nt have ick or od. Nothing I could see. Seemed to happen all at once they were all breathing hard. I put air stone in and other powerhead hoping to save them. The few others that made it trough. acted like nothing happen. These 2 times I never had that happen over the years of keeping fish. Thank you
Have you ever checked any of your fish for flukes with a freshwater dip?
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