After many many articles and videos about starting reef tanks I finally jumped in. Well made a huge mistake in not washing my sand from the used tank. I was so worried about my bacteria and losing coral and fish by cleaning to much I moved it with nothing more than 50% water change. Well no surprise my po4 are constantly above one. Can I clean the sand now by vac? If I vac sand every week do I acctualy have a shot at getting as clean as if I washed it out with a hose?can you over vac?