hi guys i have a ? my ? is about my skimmer is have a mag 3 with my urchin skimmer and i noticed its not skimming really, in the beginning it was skimming but now its not. i have a 55 g reef with 1 yellow tang 1 clown and a wrasse , my nitrate is 0 , can it be that my tank is clean enough for my skimmer to not skim? i can c inside the skimmer small bubbles but not enough to elavate to the cup. mag 3 is brand new and i clean the injector like 3 days ago. i feed cyclop eezz, small mysis shrimp, algea strips and flakes . i feed my tank every 2 to 3 days