I have both in my tank. The Red Planet is a tabling acro, so the growth pattern is different than the Aquarium City Red Milli. My Red Planet tends to be green all over, with red growth tips. The Milli is green with a little white on the base and red on all of the branches from the base up. Also the Milli tends to grow and larger base first and slowly grow up, where as my red planet grows branches out very fast and the encrusting is slower.