vortech mp40
I've got one mp40 in my 120 ( 4 foot) . Still thinking about adding another one, as I still have to run 2 koralia 4's along with my returns. Guess it depends how much live rock you have. I've got over 140 lbs, so need lots of current to get in between all the rocks. If your aquascaping leaves you with lots of open spaces, maybe one mp40 will suffice.
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