So I have a 75gallon and a 20gallon, it's my 20gallon I'm wondering about I have 5 Calvus, 2 Ottos, and A German and Bolivian Ram. Here in lies the problem I stupidly enough looked up info about Calvus but neglected to realize they are the slowest growing fish on the planet. My original plan was to grow them out in my 20gal and move them into my 75gal. So a LONG story short. Should I break down my 20gal and turn it into a African Biotope and move my S American fish into a 10gal?