Guys I am about to add more sand to my tank. I believe my lack of sand from over the years of cleaning my sand has led to a depth that is not controlling my nitrates. I have some Carib Sea Arogonite sand and I wanted to know can I add it to my aquarium from the bag or do I have to rinse it. Also I was going to do a water change. Should I do it after I add the new sand and it settles or should I do a water change and add the new sand. Please help...