YOUR FINE!! just leave it ALONE! they have a mind of their own and by moving the rock to bring it up will only make it mad! if its hiding, then its hiding for a reason! did u acclimate it? whenever i add a nem or something of that sort i drip it for an hour..and ive never lost 1 anemone! i learned the hard way with my first nem, it moved to a rock where i didnt want it to be, so i moved alll my rocks around so it was back where i wanted it..then the next day it moved right back where it was! another thing some people might not realize is WATER FLOW! typically with the BTAs ive had they usually move because of the flow....the 4 i have usually move towards a medium flow area...and i doubt ur LED is too much light for that thing..MY BTAs (i have 4) are all very close to the top of my tank and i have 3x 250w MH..those things LOVE light! .im sure not every nem is the same..but thats my experience with them good luck