Hey Everyone --
I've recently stumbled upon quite a few mentions of a "closed loop" setup on this and other forums. What exactly is that? Best as I can tell, it looks like nothing more than a pump (say, in your stand) that sucks water from near the bottom of the tank, and squirts it back in near the top through several outlets, all plumbed with PVC
. Ones I've seen pictures of don't seem to have filters either -- just seems like a single purpose device that helps to circulate water. If that's the case, is there any advantage of this over a few powerheads? It certainly provides a cleaner look (no power cords, nor PHs in the viewable area).