Navarre
Marine Moderator
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Sorry for straying off topic slighty.
Not true
) Actinics offer little to no photosynthetic light at all. Their light spectrum is far to close to the blue/ultraviolet side (22k and higher) whereas corals/algaes prefer warmer colour temperatures in the region of 6.5k - 10k.
Actinics are really only here for our benefit and to please the eye.
Actually the white light is the better one to leave on rather than the actinic if youre looking to cut back the brown algae like that, but I would advise to only turn off the actinics maybe 4 hours earlier because of the corals that still need it. Thats the one providing the photosynthesis.
Not true

Actinics are really only here for our benefit and to please the eye.