I'm considering a Walstad type tank, heavily planted, with probably a sponge filter. I plan on doing a small schooling species in there, maybe CPDs or ChilI Rasboras (any other suggestions?) and let it 'mature' for a few months (I also want to do shrimp). I absolutely love pygmy cories but I don't want to put them in an environment, so I'm not doing them. However, I think ottos look similar and are super cute as well. Is it possible to do them in a ten gallon? I'd probably do 6 of them and 8 schoolers.