in my 90 gallon planted tank, something strange is going on and i can't quite figure it out. maybe you all can help some.
everything is fine all day, and then at night everyone goes to sleep. something happens when their sleeping, as in the morning when i go to turn on the light i find everyone gasping for air at the surface. i wouldn't think this too weird from the discus as they're pains, but my 6" L091 is up there too gasping for air.
after i turn on the lights for an hour or so, everyone goes back to normal and all is well again.
i have turned off all co2 for about a week now, and nothing has changed in that time in tank contents.
2 fluval 404 canisters
water changes 2x week, 30% each
NO co2 for the time being
i added an air stone to the tank tonight to try to help with whatever might be going on, as i'm at a loss as to why this is happening. the readings are the same at night and in the morning, there's been no change in water source, and all water parameters have been stable for ever now.
anyone got any idea as to what's going on, and what i can do about it?