I havenÃ¢â‚¬â„¢t seen any gorilla crabs or mantis shrimp yet since I got the rock on Tuesday. I run the light on times and try to match the time of day and year. I have 2 T5 lights for a total of 432 watts and the corals and anemone are thriving. I first have the actinic lights on one set come on in the back and then the 2nd set in the front come on. Then the 10,000K Daylight in the back come on and then the front comes on last. IÃ¢â‚¬â„¢m trying to simulate a sunrise and sunset. At night the White Lunar Lights are on and I get the moon glow effect. I have the tank in my bedroom and have some nice relaxing visuals to look at before I go to sleep. So far no bad hitch hikers. Enjoying the show and loving it.