| | CO2 by day. O2 by night? and pH?
totally newbie here. I've had a 3g nano up and running for about 5 months. I'm finally catching up with the reading, these forums and books, I should have done 5 months ago. I'm excited to redo my hardscape and plants now that I know a little more. I have the CO2 advanced system from ada that I want to hook-up for the first time. I understand I should run it a little before the lights come on and shut it down a little before the lights go off. does using CO2 by day, mean I really should be pumping some O2 in at night? I haven't been doing either. also, someone mentioned the pH is likely to drop using CO2 ... is this true? my pH has been in the 6.0 to 6.5 range. and my KH is so low, around 1 or 2dH. GH around 8 or 9, all fairly consistent. no ammonia, no nitrites and moderate nitrates less than 12.5. should I use an alkaline regulator when I hook up the CO2? thanks.