I personally would forget about the Betta imbellis. No types of Betta do well in a community tank and are best kept by themselves. I have personally never heard of asian stone catfish or seen them in any fish store (Im from N. Ireland), which might mean they are a difficult fish to keep so maybe a better option would be salt and pepper corydorus. They grow no more than an inch at most and are an extremely active fish. I think a celestrial pearl danio is also a galaxy rasbora. They are an expensive fish where i am from. If you want a shoal of ten your talking over £50. I personally also find them a bit two small and they are quite a slow and inactive fish, but thats just my opinion on them