The left side of my reef suffers from sand movement. The ebb of the Vortech pump seems to pull the sand toward the pump, leaving a huge low spot at least a foot wide that coincidentally buries some corals on the left. It wasn't this bad at first, but something changed and it will move in a day instead of over a week's time. In this recent picture, you can see the big hole. Maybe I bumped up the flow rate, I'm not sure. I took a couple of ...
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