Originally posted by MPLS MAN
I'm wondering if you can make a closed loop without drilling holes in the tank, i've herd you can eliminate powerheads this way by running a wavemaker in the setup , any help would be great.
I did that on my last tank. Have you ever used a canister filter? Just picture the way you would run the lines on that, replace the canister with a pump and you have a closed loop. You can make the lines out of PVC...the pump you use will determine the PVC size. You can use as many returns as you'd like.
HTH