I have 55 US Gallon saltwater tank, and about 2 " of live sand. I have read that a deeper sand bed will help me with the issue of sand looking filthy and brown from the food however I already have fish in the tank and dont want to cloud it up with sand again to fill it more. I am wondering if a few clean up crew, hermits, shrimp, etc. and power heads would be enough to clean up the sand? Thoughts?