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Power heads create high velocity air flow into a column of moving water. the air stone puts low velocity air into stagnant column of water. It just seems that the power head would "mix" the air into the water better. Tucking it away from the root growth area would be a challenge, but i could see leaving a space open in a 6 to 8 plant planter for a power head and a float valve. Not sure what kind of flow the roots could take. You should try it. Go ahead, You dont want a silly protein skimmer on your 300G aquarium.
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