I currently have 5 of these at around 1 inch in a 90 gallon growout tank but will be trasnferred to a 330 gallon within a year from now. I know these are fast growers but whats usually the growth rate on these each month. I do about 4 small feedings a day with daily to bi daily 50 to 75 percent water changes. I would think about half an inch per month would be pretty standard but correct me if im wrong. They are growing out with some true parrots, cryptohero sajicas, geophagus winemilleris, and gymnogeopahgus balzanii all right around the 1 inch mark at most. Most of the fish are under 1 inch. Just trying to get a rough estimate for when I'll have to move these fish to their larger tank. The geos, gymnos, and true parrots will be going in their own 180 gallon corner wall tank and the viejas and sajicas will be going in the 330 gallon. I'll most likely be downsizing some of the stock and keeping mostly males. Thanks for all the help and advice.