HI ALL!! I CURRENTLY HAVE A 55 GAL CICHLID TANK THAT I HAVE HAD FOR A FEW YEARS NOW (A VARIETY OF MBUNA, SCOLOFI, AURATUS...). WHEN I FIRST STARTED WITH CICHLIDS I DID IT FOR THE VARIETY OF COLOR (KNEW ONLY WHAT LFS HAD TOLD ME ABOUT THEM) NOW THAT I HAVE AN ESTABLISHED TANK I WOULD LIKE TO MAKE IT APPEAR MORE REEF LIKE WITH ROCK AND CRUSHED CORAL. HOW CAN I GO FROM GRAVEL TO THE NEW SUBSTRATE WITHOUT DISTURBING MY ECOLOGICAL BALANCE IN MY ESTABLISHED GRAVEL? ALSO I HAVE BEEN HEARING MORE AND MORE ABOUT NIGHT LIGHTS? IS THIS SOMETHING JUST FOR LOOKS OF MAYBE I COULD BENEFIT FROM. SO IF ANYONE COULD HELP ME OUT I WOULD APPRECIATE IT. THANKS