Want to get a 1-5 gallon fishtank and looking for ideal fish for it?

none in a 1-3 but a betta (male) will fit alone in a 4 above. They are the best fish to keep alone as they are beautiful and don't like other males but do well with other peaceful fish that arent too big such as neons. If you want a small tank a single betta will make a beautiful tank.