I've had my 6 gallon for a while now, and I want to change things up. It's currently half RO and half fresh water, with one viper shrimp and one ghost shrimp. I also had two pygmy cory catfish, but I moved them into a larger 30 gallon community tank. I also have a large community of nuisance snails in there in case I ever decided to use them for feeding. So that brings me to this question; would this tank be suitable to have a few pea puffers? I'm concerned that they may try to eat my shrimp, but if they did start to harm them, I do have a back up tank that I could place them in. Aside from the shrimp, could I have a few pea puffers with half RO and half fresh water, or should I just have 100% RO? Also, would I need to keep some snails in a separate aquarium in order to breed? Any information would be helpful, thanks!