newnano how many outlets do you have on your 120 gallon when you had the snapper or dart on your closed loop? I am looking at a similar setup to yours. I am customizing a 120 with a closed loop. I want to use the snapper with the oceans motions 4-way, but I will use the dart if the snapper isn't going to be enough.
i have a total of 6 but only use 4. two of them are on the bottom in between the two overflows and i just open them every once in a while to raise up detritus.
the ones that are constantly open are two on each side of the overflow. on high and one low. total of 4. i ran 1.5in pvc almost all the way to them then reduced to 1in thru bulkhead and out 3/4in lockline. for flow in the middle of the tank i have my returns.
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