When we ran our 120g (4'x2'x2') as a soft coral tank, all we had on it were 2x 55w PCs and a 40w actinic. Everything grew amazingly well. In a FOWLR tank, I don't think you need much more than that. Macroalgae will easily grow under that light if you're intending to have some for nutrient export. JMHO, though. We have never had a FOWLR tank.
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