I've had mine under everythign from pc to mh. I am even getting good growth with candycanes under 6500k compact flo. bulbs that I bought from Walmart. They don't produce the nicest look, but for growth and price I am happy so far and have heard great things. With a T5, 4 bulb, individual reflectors, you should be able to keep just about anything in a 55g with proper placement.