34gal red sea max

[flipzed]

so im having a hard time keeping my nitrates down... i dont over feed the fish. its running on a stevie t media rack and tunze skimmer,... and my reading for nitrate is allways 20. no mater how many water changes i do i cant get it to come down to 10-5. ive been doing water changes about once a week.anyone have any idea what else i can try.. i mean my corals and fish look fine and are happy. but id like to bring it down a touch just to be safe..