I have a small sump I’m setting up for a nano reef I’m setting up. I don’t know what media to place in it. I’m doing a protein skimmer. But what should I add for media. A large particle, to a medium, to a floss? Then skimmer? If you can link me stuff on BRS or MD please do so, or even amazon. I’m using 40lbs of Carib sea rock, so do I need a biological media?