I have a 5 month old tank that keeps getting green algae on it. Nitrates are about 5ppm and phosphates are about .05ppm. I neglected it for a little bit and was overfeeding a lot at one point to get my nitrates up. What's something that will keep my sand clean? my hermits, ceriths, turbo, and trochus snails are not touching the stuff gorwing on the sand... i think.