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I think 2x54w T5HO bulbs will be fine. I have a 75 gallon tank that has similar dimensions to a 55 gallon tank (it's 18'' deep vs 12'' deep and, most importantly, also 22'' tall) and I use 2x54w T5HO bulbs. My lighting fixture is raised ~6'' above the water level, though, because I have my TEK light fixture suspended. This tank does not get any outside light. The most important aspect of your tank, IMHO, is the depth; Because 55 gallon tanks are taller than normal tanks (22''), you're going to need more light to effectively penetrate to the bottom of the tank. (I always struggled growing plants in that tank until I updated the lighting from T8 to T5HO.)

I wouldn't bother w/ the actinic bulb; It really doesn't contribute anything to your plants and you may not like the way it makes your plants look. If you notice you are getting algae and suspect it's from too much ligth, I would just run the lightbulbs for a shorter, total amount of time; A midday siesta may be wise.
 
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