I probably won't end up getting Dwarf/Pygmy Cories since the distributor I buy from doesn't sell them.My only concern would be small cories and butterfly fish.. Since cories love to dart up for air, I think a butterfly fish could be able to catch one, the pygmies and dwarfs are pretty tiny.
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Hm. According to AqAdvisor, I'd be pushing it if I had:
6 Sterbai Cory
6 Oto Cat
1 African Butterfly
I have a HOB filter made for 30 gal that has a rate of 125gph.
I suppose I could buy the next size up that does 200gph, but I don't want to disrupt the water too much and loose all my C02.