Duncan Coral Lighting

I have 20 gallon nano tank about 18" (cube). I want to get duncan coral. I have a pair of ocellaris clownfish, and 1 flasher wrasse. My lighting isn't good. I have marineland 6 white led bulb and 3 blue led bulb. Sometime I'm forgot to turn on the light and also the tank got indirect sunlight because I put the tank dining room. I'm wondering if I do get duncan coral, do i need to get new light or will it thrive in my tank? I do have 1 polyp coral and it thrives in my tank.