Anemone lighting...

I have a 20 gallon tank and am interested in placing an anemone in there. I have approx. 20 lbs of live rock. The tank has been cycled and stabalized for over a year. Currently the tank holds 2 percula, 1 banghai cardinal, a C. Banded Shrimp and 8 snails. So my questions are:
1. Will the tank support the anemone without overloading the bio mass?
2. I notice some of the anemones require "strong" lighting meaning how many watts and what type of light? I currently have a 15W Actinic light (however, i think that its not enough)
3. If i do need more lighting, how can i upgrade it. Do i need to get a different ballast, light or new hood.
Bear in mind, right now my tank is your run of the mill set up.
 
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