If you dont plan on doing water changes i would nt even get into the hobby , Water changes help replace nutrients , that are taken from corals fish and anemones and also skimming , without water changes you are going to have high ates and phos levels and the qaulity of living for you fish is going to be horrible and affect there mood , i do a 20 percent water change every week , (because i changed my CC and im trying to get rid of ates , i will be doing a 10 percent change weekly when they go down