I saw walmart has puffers which I believe are green spotted puffers. They were not marked but I'm almost positive that's what they are. I really would like to have 1 or 2 but I know basically nothing about them. What size tank do they need? Water conditions (fresh, brackish)? And if they require salt how do I go about that I have never had anything but freshwater before. Also, if they are brackish or marine, what could I use to keep the algae down, and what would be best for cycling the tank? Thanks!