What's going on. I have a 40 breeder bare bottom mixed reef (mainly LPS and Softy). I didn't have much fun with sand in the past as it would blow around and even facing the power heads to the surface it'll still cause dunes in certain areas. I like bare bottom because it's very easy to clean, but I want to try black sand to add some extra color pop. I was told to get bigger grain and and only use 1 power head instead of 2 to lower the flow. Does anyone know of a brand for black sand that has chunky grain?