I have a 12 Gallon Fluval tank and want to put something in there to help with food my betta misses and floats to the bottom as well as algae that is on the rocks. I really don't want snails, or cories; I've read that loaches need groups and Plecos get too big. Is there anything that I could get that could be by itself in a smaller tank and actually feed off the bottom? Oh I have an Amano Shrimp but he doesn't really help. Thanks for any suggestions!