I've got a 120g that has 2x 55w of PC and 40w of NO actinic. Doesn't sound like much light, but compared to our 67g with 360w of VHO and a 37g with 175w of MH, the 120g is by far the brightest looking tank. All bulbs/tubes were changed at the same time this spring.
Anyway, the 120g grows magnificent xenia, mushrooms, GSP, BSP, various macroalgae and pretty good coraline. Haven't tried any lps in the tank because of a coral nipping lattice butterfly.
I try to keep alk at 8-10 dKH, Ca at 400- 425 ppm and Mg at 1300-1325 ppm in all three tanks.
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