The growth rate seen pretty good to me. What are you feeding it currently? Even my smaller aros which are on pellets are growing pretty fast when you feed them enough daily. And of course, the quality of the pellets fed must be good and high in protein.
i would also like to know what u are feeding your aro. that is a good growth rate right now at 1.5" per month. and awol, blake insisted other ppl post pics of their aros.