Are you cycling your tank using the damsels? Honestly, this is an outdated practic and is very hard on the fish. Besides, damsels are very aggressive fish and many aquarists want to get rid of them before adding other livestock to the tank. There is a great arcticel on "fishless Cycling" in the Articles section at the top of the page. I suggest taking the damsels back and cycling using this method. LR
provides what is known as biological filtration in the tank. It provides a great environment for benificial bacteria to grow. These bacteria help maintain a hight water quality. There is no better filter for the home aquarium then 1.5-2lbs/gal
. You do not need any special lighting for your LR
to get the great benefits of it's biofiltration. However, better lighting will help with the visable life on the LR
. Things like coraline algea will benifit from a good lighting system and eventually cover your rock in colors of purple, blue and red.