A single 6000 in one of the corners would be best- ideally the back corner to take advantage of the deflection of the curved front. The deco rock has to be the top rock or very close to it beause you have to clean the pump every few months.
I don't think animals getting sucked in is too likely and yes I think one pump would work. Here is a weird possibility that we have found with the Stream rock- wrasses dart into the rocks when freightened and that hole looks real secure so given the high speed they can travel a small wrasse can enter and it is like a Bass O Matic. The wrasse would have to be less than 3/4" in diameter.
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