HI! I have a Zig Zag Eel that we've had in our 75 gallon tank for well over a year - nothing has been added to the tank in the last 6 months - things have been going perfect in the tank - great readings, regular maintenance, etc - .....except for now! My Zig Zag has been laying down at the bottom of the tank the last 2 days. He's always been a fairly inactive bottom dweller, but he's experiencing labored breathing and his mid section floats up?? We have him isolated in a seperate tank, but would love suggestions on what to do for him! He's part of our family and I hate seeing him suffer...but have no idea what could be wrong with him, or how to treat it. Btw, his tankmates are 2 rope eels, 2 raphael catfish, a Clown knife and a very small bala shark (a transplant from another tank where he was being picked on). Thanks!!