I keep a bit higher than maybe "normal" for three reasons...
1-lense does not get stained by the creep
2-less affect of the salty humidity above the water on the units.
3- these lights a bit focused, so higher placement wides the area lit, a a bit more diffused.
Once you find a setting....just let it sit for a bit....then if you need, ramp up a tad.....
You want enough light to feed corals but not algae, there's a balance you will find.
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