The loach idea isn't a bad because it takes them years to grow to their full potential. I've had a clown loach for about 5 years is still only about 3.5" and maybe instead of clowns you could do Yoyo's? I'm not positive but I don't think they get as large in the long run and the 55 would be able to hold a shoal of about 5 or 6 of them.
























