hello everybody it's me again!!! well i have my 10 gal.SW tank set up with sand and live rock..i did put a damsel in there ..i ahve had it up for almost a week now (since last thursday) ...i am using a filter sistem and a regular air pump..everthing seems to be going well..but since i don't have a protein skimmer on it .i was wonering when to do a partial water change? or do i need to do a water change at all ? the water is really clear..i still don't have a test kit yet but i do have a hydrometer. the salinity is perfect..i am going to take a sample of water to my LFS tomorrow and have it tested to see how the water is for nit..and such..but i was just wondering about the water changes? and thanks to everybody that has helped me in the past..and thanks in advace for anymore info you can give....:thm: