Wish mine grew upward, for whatever reason my red planet keeps growing outward, acting like an encrusting monti. Started out a plug size, now covering a 5 inch circular area
The amount of light definitely has an affect on the coloration. It's a pale pink and white in my shallow tank where it sits about 10 inches below the surface of the water beneath a 250w radium. It grows extremely fast in that tank. In my t5 tank it's mostly a deep green with red accents.
Most red planet it a tabling coral....Mine encrusted fast and is very red with green mixed in the base. I have a ora green planet thats encrusting fast too.