I recently transferred my betta (along with the filter, etc from her old tank) to a new ten gallon and got her a few otos to keep her company. The betta has no interest in nipping at the otos but she helps herself to the seeded centers of their cuke slices until she bulges. No luck with algae wafers... she gorges on those too. Any ideas on how to feed -just- the catfish, and how to deal with the betta in the meantime?