how many pellets should i feed my oscar and how many times a day its about 5 inches

if I was you, I wouldn't work on how many pellets you feed your Oscars. By far the best way of feeding an Oscar is to drop two or three pellets in , let him eat them and then do it again, do this for around two or three minutes and he'll get more than enough to eat. You should probably feed your Oscar twice a day.

thank you