You can use low light loving corals like shrooms
and polyps. There some corals that need low or no light. You will probably want to get some more LR
for filtration and so the corals will not be on the bottom of the tank. The big question is what kind of fish do you have or want to get. Make sure all of your fish are reef friendly and will not eat your corals or inverts. You will be inheriting all kinds of stuff on the live rock and even on the coral rock. But that is the same lighting setup I started out with so I know it works on the lower light corals.