I am setting this up as a frag tank and debating if I should do a bare bottom display and sand in the refugium or have sand in the display for equipment so far I have a bubble magus skimmer with a tunze hydrofoamer pump mod a radion gen 2 a 700 gph return pump going to start with a koralia 750 and buy one more powerhead eventually want controllable pumps on here but its not in the budget at the moment but really looking for pros and cons of bare bottom on this frag/ display any other ideas are welcomed too 