What type of lighting do you have on your tank? Are you shooting for a FOWLR (fish only with live rock) or reef tank? If you're wanting a reef tank, you're going to immensely upgrade your lighting. You need to go with either 2X250watt Metal Halide lighting or a 48" 6 bulb T5 fixture. Without seriously upgrading your lighting, I doubt you'll have any luck getting anything other than your fish to live very long. Might consider taking the anemone back to the LFS where you purchased it and explain to them that you just don't have the facilities to house it. I'm sure they'll understand and if they're a very reputable pet store, they'll be able to recommend lighting for you. Although, if they knew your current lighting set up and sold you an anemone anyway, I would seriously question them as a source for information or further purchases. Another questions that I didn't see asked, are you running a protein skimmer? If not, consider that a necessary item as well for a reef tank.