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Cory cats are active and clean the bottom well as they are scavengers...my personal favorite is pandas but they like a bit cooler. Keep my tank at 78...
Kuhlis are one of my favorite fish, I had a group that lived for close to 10 years! They definitely have to be in a group though, otherwise they'll hide.
In a 25g I'd have a big school of neons, some sort of centerpiece fish (gourami?), and a large group of habrosus or pygmaeus. Not only*are they small but they're very active in all parts of the aquarium. I currently only have 4 pygmaeus but they're a group of clowns...looking forward to seeing how they act when my order of 8 more arrives next week