I was wondering if anyone has any ideas as to what happened to some of my favorite fish. I have a 30g established planted tank that has been running for over a year with a diy CFL light setup, diy canister filter and pressurized CO2. I had a Synodontis catfish, a Delhezi Bichir, 3 Kribensis and 3 Chinese algae eaters in there. About 7 weeks ago, a friend of mine gave me a Synodontis catfish he'd had for about 3 years. It was in my quarantine tank until Thursday night, with no issues, and I moved it to the planted tank.
On Friday night all fish were alive and well, swimming around as usual. Saturday night I didn't pay too much attention to them except for feeding at around 8 pm, but nothing seemed out of the ordinary. Sunday morning at around 5 am, before I left for work, I found every single fish in the tank dead. They all had a slight yellowish color to their skin and scales, no cuts, bite marks or anything like that.
Any ideas what might have cause this? Other than a slightly elevated ammonia level, all water parameters including pH, nitrite and nitrate were normal. The regulator is working properly, and even in case of a malfunction, it's setup on a Hagen ladder, which would prevent over absorption of co2 into the water.
On Friday night all fish were alive and well, swimming around as usual. Saturday night I didn't pay too much attention to them except for feeding at around 8 pm, but nothing seemed out of the ordinary. Sunday morning at around 5 am, before I left for work, I found every single fish in the tank dead. They all had a slight yellowish color to their skin and scales, no cuts, bite marks or anything like that.
Any ideas what might have cause this? Other than a slightly elevated ammonia level, all water parameters including pH, nitrite and nitrate were normal. The regulator is working properly, and even in case of a malfunction, it's setup on a Hagen ladder, which would prevent over absorption of co2 into the water.
