Marty, although you can always add more power heads have you tried moving the power heads you have? How are you going to do the closed loops is the tank drilled? I know in my 90 I had the Mag 7, two hagen pro 4s and two Rio 1100s plus a couple of other power heads if I remember right. The mag7 is a decent pump but if you have alot of 90degree elbows in there you'll really loose alot of the water flow.
Doug
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