i recently had to separate my betta from my community tank and put him in his own tank. its a small tank between 2.5 to 3 gallons. i have a small heater that keeps the water around 78. i have an airstone in the tank to keep the water moving. i was thinking about adding a single cory (albino,panda or pygmy). i dont like otto cats because they are not very hardy and primarily eat algae. i need a bottom feeder, any ideas or thoughts on my idea?