midday burst

Hi guys Just a quick question. Is my light enough for growing red plants like A. Reineckii? Or should I increase the midday burst I have? I have 2 x 54W T5 HO over a 55g tank ( about 18" deep) I have 1 bulb on for 2.5 hours, then two bulbs for a 2 hour burst, and then 2.5 hours with 1 bulb...