Some people have suggested a few things for companions...
I bought 4 kuhlis today, 3 of which were killed (stress and nipping, oddly enough) but one stands, and how crazy is this, my betta is practically protecting it. He swims over him and flares his gills at the side and won't leave his side when I look into the tank...? WEIRD.
Some have suggested (in addition to snails),
Cories (Bronze, Pygmy, and Panda)
Platies
Black Molly
I've done some research on all, and the best fit sounds like a trio of Platies. Why? well, my Betta obviously hates things smaller than him, so I thought maybe if I acquire 3 platies, which are larger than others I've had, he'd mind his P's and Q's, suggestions? Advice?