its a single stage coralife timer, which i plan on swapping out in the summer after i start making some real money. And i will run the 10k bulb on different timers for each tank. I also picked up a 8 switched american DJ power center so that i can hook up all my skimmers and powerheads to for feeding, water changes, etc. I got sick of digging out the power strips and unplugging things. thanks for the help