yeah these guys grow like weeds, with varied food (pellet staple of course) and good waterchange schedule you could definitely expect an inch a month in the beginning. when i was growing out two little rescue jags, the only food i had that was small enough for them was flakes, so i was just feeding them flakes and doing good water changes and they still grew an inch a month for two months (which is when i started feeding pellets, and one killed the other and i re-homed the other one) so im sure with actual good food they could grow even faster