i have a 20gal tall tank filled about 70% up with a little spot for my res i am going to get this week he is only the size of a 50cent peice and i was thinking about getting a fish to put in the thank with him. has anyone done this be for? my lfs has about a 7inch red tail barb i was thinking would make a cool tank mate.. any advice on what kind of fish/animal as a tank mate