How many Red Belly's can go in a 125 gallon for life? I have read other forums and posts and I get a very broad answer. Usually from 5 to 15. What is the ideal amount to have? I do water changes 25% twice a week, I have a Fluval Fx5 and Magnum 350 with a AC110 hang on back. I have exodon tetras and a few Convicts for dithers.