Ok, I'll start off by saying that I have raised fish off and on for 20 years primarily Discus but I am really stumped with this one. Right now I have a 100 gal. aquarium 4 young Discus, about 3 1/2 inches two small plecos. two Cory Catfish and and one Black Knife. The ammonia is is 0, Nitrites 0, Nitrates 10, ph 7.0. The only thing I'm doing now that is new is having a planted aquarium with about 10-12 plants. I also have two canister filters one up to 150 gal. one up to 75 gal. and a hanging filter up to 100 gal. I run s do2 system, pressurized lots of water movement ther is no reason to have low oxygen levels in this tank as far as I can see yet all of the fish show signs of Oxygen starvation. When I first saw this I stopped the co2 and whatever might use up oxygen even after that they still act like that. My Discus in the past have always thrived in the aquarium but I am really really stumped at this one and it's driving me crazy. What the is going on I really need help with this one. I think I covered everything. Can anyone help me on this?
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