Welcome to the hobby. I would return the anemone. You should let your tank get more established before adding one. If it dies and your not around it will nuke your tank.
They work good. Just keep them cranked all the way up. I keep sps at the top. You might want some supplemental lighting. I wired 5 Crees and use aluminum tubing for heat disperse. I just zip tied it between the 2 current fixtures.
I just joined here. I wanted to share a few pics of my 20g long but I don't have enough posts. Here's a list of my setup.
-2x Current USA orbits marine LED's
-1 diy luxeon 5x royal blues
-Marineland c-160 running carbon and filter floss
-Jebao wp10 wavemaker
-Korlia powerhead (forgot the size)...
I use 2 fixtures over my 20g long. I keep my softies and LPs down low and sps up high. I have got growth in all my coral. It started to bleach some ZOA's I had up high.