As some of you are aware I have recently set up a new tank about 1 month ago, added fish last week, (2 Black Clowns, Scarlet Hawk, Royal Gramma and a small Zoa, my Ammonia is fine but Nitrates and Nitrites are at the higher end of the scale, I have done two 10% water changes in that first month the last one being Monday, Iam feeding frozen Mysis, (1 cube over 1-2 days), btw its a 240ltr approximately 55gallon, thanks James.