I use night mode on my Tunzes, and wish my Gyre had night mode. The SPS extend their feeder polyps at night, and I find if I turn down the flow with the night mode the feeder are polyps are extended even bigger. I feed them in the evening after lights out and add the Aquaforest additives too. The bigger the feeder polyps are the better they are for catching food so I like the night mode.

I noticed that for me aggression among fish tankmates went way down when they no longer had to fight for the best hidey spots in the rocks. So I always tune my flow down now.

Ocean doesn't shut off at night big no for me