FWIW, I didn't like all the noise from the Magnetic ballasts at first but everyone assured me it would quiet down and it did. I have a 90, same as yours just not so much front to back room and I find two 175 10,000k and 2 NO actinics to be a nice combination, it all depends on what you want to keep though. If I had my $$ back I probably would have gone to the 250s but then again, I may have even gone to 400s so I could keep Acopora.
My Montipora's all do great under the 175.
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