Yeah, every so often - today again, as a matter of fact - I get a bug about getting mine a roommate. Fact is, a 5g is probably just too small. I thought about snails too, but if they eat shrimp why wouldn't they go after a snail? He's got a lot of time on his fins in there! It's not just bettas that can be aggressive either. I just read even those African Dwarf Frogs can be as well. Nerites are sensitive to nitrates, so keeping up with water changes benefits both.
So, I would agree plants, or other decorations are probably the best way to go. My betta builds me a bubble nest every time I drop a new plant in - lol.
Last edited by craiger75; 07-19-2012 at 10:06 AM.