Apart from the noise, when it drains itself, at the end of the cycle, it sucks air to break the siphon so that the pump can catch up again. That air is blown all over your corals etc.
That air cannot be that bad? That is the same thing that happens when a wave break over the reef. As long as you have proper waterflow to stop the bubbles from froming airpockets underneath the corals, you should be okay.
Yeah they may be unsightly at times, but do we have to care for our corals or for our viewing pleasure? I feel that is a fair trade off for the health of our corals.
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