A few weeks ago I added two young emerald catfish to my 2.5G QT. A few pond snails aside, they are the sole occupants of the tank. They're both small: one is ~1"; the other is ~1.25". The smaller one, Jill, seems to be doing just fine -- poking around in the gravel, butt in the air, like a good brochis should. But, I noticed last night that the larger one, Scott, seems to be having difficulties. I don't think he's been eating (can't be sure). And, he's having trouble remaining stable (looks like a swim bladder problem?). He'll just start floating upwards for a bit or start leaning to one side before righting himself. He's occasionally darting to the surface like all my other emerald catfish do from time to time; so he hasn't completely lost control of his swim bladder. Otherwise, there are no visible signs of any problems. Here are some tank stats:
- ammonia - 0ppm
- nitrite - 0 ppm
- nitrate - 0 ppm
- pH - 7.4
- temperature - 79 degrees F
- filtration - Whisper 10 (was on my old 10G)
- water changes - ~20% weekly
I'll update.