Unless you plan on cleaning your canister filter on a regular basis (like at least weekly) it will probably end up doing more harm than good. Canister filters usually aren't recommended for a reef tank. As for powerheads, you might want to look into a couple koralias or at least something a little more powerful than 250gph. You would need like 5 -10 of those wokrhorses to create enough flow. Aim for at least 20x turnover in your display tank.
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