Since it's connected to the main tank I don't think you need a dedicated carbon. It's all the same water I'd guess.
MP10 would be pretty fancy for a frag tank. All the bigtime fraggers I've been to actually keep their frag systems very simple and their wares are incredible. Save a few bucks and have a couple smaller powerheads on opposite ends and have them blow to make a whirlpool. One on right hand front, other on left hand rear?
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