Is there anything small enough to add to my 3 gallon with my betta, other than a ghost shrimp. My betta tends to kill ghost shrimp except for the last one surviving in the bowl right now. So I was wondering is there anything else that can keep him company. Also, I am not too fond of ADFs, even though they probaly can not be added anyways. How about pygmy cories? Or panda cories. They are a good bottom feeder, but they are more active and interesting than an oto, since they are like 2x more lively.
If your betta kills ghost shrimp, it may be because he's not very tolerant of tankmates period. He'd probably pick on the ADFs too. Unfortunately, some bettas are this way. Corys are most happy in groups of five or more - no way in a 3 gal. The only other possible tankmate I can think of is a snail.
__________________
two gallon with 16 gph filter with live plants and a female betta named Meloday
3-4 gallon with 80gph ... Planted lightly three white clouds ( Birtha Clara and Delila) and some snails (mainly melodys snacks)
9 gallon with 130gph , heated with male betta (Trafalger RIP)Kaden ( a male betta)has moved in, pygmy cory (MaMa) , pitbull pleco(Metal), three preacox rainbows( Annabel, Glitter and Mondo) and various snails...
A 3gal tank is not going to be a community setup anyway, so I think it is perfectly fine for a betta by himself. It is too much to ask him to share such a small territory.