I use 25lb co2 tanks, I have 2. Each one will last few months. It not like the calcium reactor, that was bad.
Fish, I have a dozen sparkle gourami (or whatever they are called), a dozen threadfin, two sunset gourami, and one neon gourami.
Crabs and crawfish, I have a redclaw, a fiddler crab, and a Mexican red crawfish.
Shrimp, I have 2 vampire filters, 5 wood shrimp, 8 amano, 1 tiger, and 20 crystal red shrimp "I started with 6". I am about to pick up another 100-150 crystals for breeding
Last but not least is a long fin albino bushy nose, I will be getting a nice male here soon