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.
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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^
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