I am newer at this hobby then you are. My tank is 4 1/2 months old. But my guess is it is still your lights. By what I understand it not nessicary the watts per gallon but the spectrum of the light. If you don't want the add expense of MH lights, then what about T5's? By what I understand they are the next best thing to MH. Also post what your water parameters are.
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AGA 120 Megaflow, 2x 250w HQI MH and 2x 54w T5 Actinics, Euro Reef CS135, Sump, Pacific Coast 1/10 HP Inline Chiller, PanWorld External Water Pump, Red Sea Wavemaster Pro, 4 power heads
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