My latest batch of Aros (3) gets fed 5 x a day...Just a little bit not to the brim, I try to keep them hungry...it works to feed them variety...
Try to implement Hikari Food Sticks...it's the floating pellet that has the silver Aro on the package...it is the one I use for the base food, then I supplement with Prawns, meal worm, krill, F/D bloodworm...
Good Luck with the young Aro...he'll be chowing everything in no time...