I have plenty of filtration. I have 2 Rena XP3 canister filters. I have plant current action in my tank so I know the CO2 is getting mixed up.

I did have a dead fish. I found my pleco dead and partly decayed when I did the water change, it was in all my plants hiding. I will check the ammonia level again and I guess I should change more water if I have any. I could have a bad reagent. The first test kit I got I had to exchange (that was why I was in the LFS earlier that evening).

I read some old threads about CO2 and Excell so I have added Excell tonight in hopes that the BBA will die. I also think I should probably do the clorox thing with some of my plants. I don't know when I should add excell again. Do you?

I really want to know about the CO2 being turned up with my pH already at 6.5 (I have a pH indicator hooked up to my solenoid, which was calibrated so I know the pH is correct.) BTW my drop checker is a vivid green tonight. Without raising my KH my pH will continue to go down. Of course I have also read that since I dose other solids that is also making my water harder so the GH is not a true measure, right?

Any ideas, anybody?