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For that deep of a tank, I would start off at around halfway on the intensity knob and adjust from there.
If on the controller, I would cap it around 60-65% to start to allow for light adjustment
How high from the waters surface are the lights mounted? Kessils give off a lot of light so...
Looks like flatworms, zoom in on that middle closed polyp. Under the 2 dots, It looks that horseshoe shape that flatworms have.
Not saying it is but it looks like it.