The air bubbles won't cause any problems, unless there's a leak somewhere in the plumbing and its drawing in air from there.
As for the powerhead, no. It helps increase circulation but not necessary and the added canister would probably be a better choice if you were to choose one.
As for the powerhead, no. It helps increase circulation but not necessary and the added canister would probably be a better choice if you were to choose one.
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