I have an established 10 gallon tank that currently is only housing my male half moon betta and a black mystery snail. My betta Phelps doesn't seem too aggressive; he checked out the snail for 5 min then lost interest when I added the snail and when I had ghost shrimp he never bugged them. I currently have 1 java fern, scattered silk and smooth-edged plastic plants, and a large hallow piece of driftwood. I would like to add some tank mates and would like some ideas. I was thinking maybe neon tetras, ghost shrimp again, or an ADF or two. My betta isn't a very strong swimmer due to past injuries so I want something that won't overload my undergravel filter. I will eventually be adding more java ferns once this first one is more established to help maintain the bioload.