#!" posted before I was finished. 1-1½. Pellets for that size fish. Increase with time. Show approx. size pellet on ruler when have time? I am talking about a 2mm pellet. Your call. But if you want normal development rather than forced growth. He should mature 6 months to a year and continue growing. Be big soon enough.
Unless he has been showing gravel foraging behavior and/or gobbling all the food as it is introduced to tank--with 7-8 pellets there might be a water quality problem. Maybe not with that quantity of water, growing beneficial bacteria culture and good filter, water parameters might be alright. It is just one little fish in a big tank. Maybe some Prime added to just to be Safe. Fish are also constantly foraging, including eating microscopic algae as it forms on Tank walls and decore. Cichlids are omnivores. Bug bites is also super nutritious food so slightly less might be indicated.