well said:I won't get into that dans bed debate here but suffice it to say that I think sandbeds are still appropriate for about 75% of tanks and especially softy and LPS tanks.
You don't have to drill for a closed loop. I had one without a hole for a couple years. Marc had one for several years on his 29 without a the tank being driled.
You could always just put a few maxijets around. For a softy tank 4 or 5 would be plenty.