I prefer to use convicts as my feeders. I have 6 pairs constanly breeding, I siphon the fry off as soon as they can eat live brine shrimp. I have had some people question me about feeding my feeders live brine shrimp, but it makes them grow faster and I figure the target fish gets the nutrients in the end, so its a win/win. I also have the temp on the grow out tank warmer than usual. I cant remeber off hand at the exact temp, and i'm lazy and dont want to run to the basment to check, sorry. IMO the live brine shrimp (rinse well) with the increased temp seems to speed up the growth rate of the convict fry. But with 6 pairs pumping them out, it seems like I always have plenty of 3/8"+ feeders to go around. Consider the size i'm using too, i'm not sure what size your wanting to get them to before you feed them to others?
Goodluck
L8r
O.