I played around a bit in my tank, with a different LED albeit, and If I turn off my pumps, then the disco disappears a little. I think pretty much every LED fixture will look great over air shining on the floor, but when you get ripples on the surface, it diffracts the different LED's at separate angles, which causes the disco. At least that's my theory. Possibly some of the disco effect varying between users has to do with the motion at the surface of the water. Less surface ripple could equal less disco.
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