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.