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Need a little more info. How old is your tank? Do you use tap water or RO? Coraline is usually purple in color so you may have a case of nuisance algea. Did it come on all of the sudden? what does it look like?
It is a 75 FOWLR Some of the rock has alot of purple. But since the snails have been cleaning the brown algae, I'm starting to see some green. There are some small spots with dark green, but mostly a light coating of green. the tank is about 2mth old and I only keep the light on for about 3hrs. I'll try to take a picture and post it.
Good catch Darb, I missed that blurb about lighting for only 3 hours. You need to up that to 12-14 hours for the general health of any photosynthetic organism, or even if you just want nice coralline.
2 10 k and 2 actinics is good. Just increase the lighting to 12 hrs a day. It dosen't have to be any specific 12 hrs. Mine are set from 9 am to 9 pm,(when ia am home) with the actinics on 1 hr before and 1 hr after.