| Mike, you already know that I am clueless when it comes to plumbing. But like John, I question if decreasing flow at lights out is really in the best interest of your corals. I have read in many placed that they feed at night. If anything you might want to go the other way, more flow at night and less during the day. This could have a side benefit that the heat from pumps would not be added to the heat from your lights.
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