What I did to optimize growth while still having a fish that had great colors/ finnage/ etc was with 3 feedings a day. All I fed were some high protein pellets and the occasional feeder guppies/ ghost shrimps. Along with that, I did daily 50% water changes, sometimes 75% or if I missed a day, 90%. My jag went from little more than 1" to 5" in less than 3 months in a 10 gallon grow out. And no, it wasn't stunted at all. 