Right now i have a 20 gallon that i'm using to grow out my senegal, but pretty soon i'm gonna move it to a 50 so i'll have an empty 20 gallon. I'd really like to get a puffer fish, but i don't know much about them, and can't find too much about them on the internet, besides the dwarf, and that the green spotted is a brackish fish. I really like the green spotted puffer, but I've never had anything besides a freshwater tank, so i'd like to stick to that. Any ideas for a decent sized puffer that would be fine in a 20?