I have a 1.8L DIY yeast generator with a nano glass diffuser in my 15 gal tank. Currently I'm debating on whether it's worth it to run an O2 airstone when the light is off. I've been hesitant to get a drop checker since I've read that it's hard for a DIY yeast generator to make too much CO2 that it becomes harmful to my fish. Anyway, what's the bottom of this? Yes or No?