There is one other down side, minor as it is, if you place itnext to a powerhead (I leave mine in the tank all the time) it can increase resistance and make the powerhead run less efficientlly due to the magnet interfereing with the magnet in the motor, but the difference is unnoticable to the
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eye, but can cause excess wear and heat, but this is only if you keep it next to a powerhead.