Hello all. New to the saltwater game. Have had freshwater tanks for years. I have a 40g all in one tank I have a 4" bed of live sand have 30-35 lbs of live rock. I went to my local fish store after having the tank cycling for about two months with no fish. The second month we added two shrimp 6 snails and about ten hermit crabs. After the second month water levels were perfect and had them rechecked by the local fish store. (Yes) time to add a couple fish. We added a frostbite clown and a dwarf bicolor angel along with an lta. Everything seems to be going well been one week nitrates are the only thing that are a little high they are 30ppm. Just did a water change. Was wondering is once a week enough right now or do I need to do a water change more often. Thanks