Live sand does not need any form of lighing.
You could add live sand to your cc substrate BUT you need to be aware that over time the cc will come to the surface and the sand will settle to the bottom layer. An ideal sand bed would be made up of particles sugar grain sized by majority.
Actinic lighting is the light that is deep blue/purple in color. Its simular in apparance to a black light but its NOT a black light. Actinic bulbs have the majority of their color spectrum in the 420mn range (i thiink this is correct with out looking it up).
All other blubs have a spectrum assocated with it. This is also called the "KELVIN" rating. The higher the rating the more blue light is present in the bulb. You have 5500K, 6500K, 7200K, 10000K, 20000K etc. I personally prefer 10000K and actinic combo of lights. That would be two bulbs one at 10000K and one at Actinic.
Two lights on your 20 will give you a wopping 38W (i think the bulbs are 18W each) of light. This is 1.8W of light per gal
. If you want to keep corals and yes sea anenomes are a form of coral then you need MUCH more light than that.
You can get more light by using Power Compact Florecents, VHO
or Metal Halide blubs.