Decided to bite the proverbial bullet and do a DIY CO2, I was going to try sticking the tube into the impeller of the filter. I'm scared. giggle. Never done CO2 before, I'm terrified that I'll end up killing fish.
I want to be careful cause my plan for this tank is to breed Galaxy Danio from an already captive bred source. I'm so taken by this fish that I want to help the captive bred population to hopefully reduce it from being snatched from the wild.
good luck with the CPDs. they are really fun fish.
oh and btw, the name people use now is Celestial Pearl Danio (CPD). they used to be Galaxy Rasbora, but never Galaxy Danio.