So my brother just purchased a 30 gallon tank. He has currently got a 10 gallon tank but he wants more plants. This won't be an upgrade but an addition. Anyway once the tank is ready (cycled etc..) he will move the redtailed shark from his 10 gallon home to his nice new home in the 30. That will leave cherry barbs and cories in the 10 gallon. So the question becomes what would be a fun group of fish that would go well with the shark. I have never owned one but I hear they can get aggresive. Is there some good loaches that might work in that tank? I had suggested tiger barbs in a school would be nice as well. They have to be plant friendly fish and he tends to like more smallish fish rather than a few big ones.