Circulation for a 210 gal

[TheReefGeek]

I think he is now thinking of going with the Dart on a closed loop manifold like I do.

You are going to have much more than 1 foot of head pressure on the manifold though. First you need to suck water up out of the tank (I use a 1/5" pvc length for this, with slits cut all in it to diffuse the water flow so the pressure per square inch is reduced to a decent level.

You get some head pressure from sucking water up, then for every 10 feet of so of pipe you have 1 foot more, plus 1 foot more for each 90 degree turn.

Try the dart on a closed loop manifold, go 1" all around, with 5-6 t's that are 1" going down to 1/2" threaded so you can thread in 1/2" loc line with nozzles. If you want to test cheaply, start with 1/2" 45" elbows instead of loc line to see if the total flow is good enough, this is what I started with, then bought the loc line later.