CYaNO BACTERIA: red slime algea has to be one of the most frustrating for new reefers.It usually breaks out on the surface of the sand substrate.2 ways that i know to remove the cyano is to first increase your water flow. u want to remove any stagnent areas by the subsrtate. Two remove excess nutrient, I prefer to do a 10 percent weekly water change with ro di water or di water. (do not use tap water) while doing a water change syphon out as much red algea as possible,also dont be afraid to cut your light back and your feeding, I leave my light on for 10 hrs a day in my 90 gal tank its ok to cut back to 5 hrs for a couple of weeks