Hi Anonapersona,do you think thats a large swing from 6.7-7.5 .The books say to have the CO2 turned off at night or the Ph will go further down,and the plants dont really use it so its being wasted. But no I havent tried leaving it on during the night. I know you are using the yeast plantgro system and probably leaving it on all night.What Ph swing are you seeing? (still doesnt explain why the other fish seem effected)
15gal planted,flourite+volcanite,65 watt pc,whisper 2 filter,5lb CO2 tank and diffuser,flourish .