I'm a newbie, new build, and trying to decide, sand bed or rubble? have a 150g display tank, 60g sump with 25g refugium area. Refugium has a <em>flow through </em>design, and I'm worried high flow will blow sand out. My goal with the fuge, in my ignorance, is pods and fauna for a SPS centric tank. I've been reading, but have not found anything really definitive, so, I thought I'd ask for input. Be gentle.