I would say give it more time. For reference I feed 2 cubes a day plus 2 sizes of pellets so I feel like it is safe to assume I feed a lot more. I only get away with that because of the ats and also the new skimmer I bought is rated for over 600 plus gallons.
Feed your Filtration
Give it to Porc Chop he'll eat anything!!!!!
"This is my tank and these other fish just live in it"
^ Quoted from Porc Chop^