Thanks for your reply.
90 gallon fish only with protein skimmer and UV
Salinity 26 (purposely low)
After reducing light, performing a partial water change, plus the addition of a Kole tang and a flame angel, the algae situation seems to be resolving itself pretty nicely. Minimal diatoms and the green stuff in the substrate eaten up mostly by the tang. I guess my question is whether or not you can cultivate "good" macroalgae in a fish only tank without live rock or a refugium. I guess I'm not used to the act that you have to scrape off some algae and at the same time feed them other algae, but I guess that's just the way it is.
Yellow-eyed Kole tang
Solorensis red head fairy wrasse
Purple fire fish
Pair of ocellaris clowns
Long nose hawkfish
3 damsels (they haven't killed each other yet)
I'll probably add a goby and that's it (unless I listen to everyone's advice and return the damsels!)