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It looks like a baby starfish to me I didn't buy him lol I just started my tank Monday and added water to it and bought 2 "live" rocks... So I called my LFS and asked them if it was passable it was in the rock and they said yea lol so I got my first addition to my first SW tank I'm excited!!
Mine have never been larger than a dime and most are much smaller than that. I'm don't think the light will affect them either way but I'm not positive about that.