LR is just porouts rock that is colonized by nitrifying bacteria. It's also a good place for all sorts of critters to live, as aplace to attach corals.
LR by itself does not need much light. Nor does coraline algea. Corals will need light, though they thrive in a variety of lighting condiitons, depending on your selection.
An anemone should not be placed into a tank until it iw mature (8 months to a year) with proper lighting and room for it to grow. I'm not sure a 10 gallon is the best place for one.
It sounds like this unit is also going to be a cover on the tank. That's generally a bad idea as it interferes with the free exchange of CO2 and oxygen that occurs at the water surrface. This could cause you have a low pH condition.
oh, and WELCOME to AA
