Hello! some time ago when i was experimenting with CO2 my tanks gets a lot of BBA, then i change to a non co2 excel tank and many of the BBA die, now BBA dont grow but there some that still there and dont die! i was checking the co2 in my tank and in de morning when the lights are off the co2 is arround 5 or 6 ppm (ph 7,5-KH 5-6) but at night at the end of photoperiod the co2 changes to 1,5ppm (ph 8- kh 5-6) so i was wondering if this co2 Fluctuations is the cause? and if do i should up the ph of my tank to lower the co2? thanks!