the motor is on the bottom on the magnum so it will work great for that. with the fluvals, eheims, renas they all have the motor on the top so they'll eventually stop working as the canister fills with gas.
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15 neon tetra, 5 red phantom tetra, 11 ottocinclus, 9 cardinia japonica
AH supply lighting, Seachem and greg watson ferts, eco-complete