i had an anemone when i first started up my tank. stupidly on my part, i didn't read up too much before i put him into my tank. i don't have the right lights, and the tank wasn't well established enough for something like that. anyways, when they die, you will know it. they completly shrivel up and almost look like they are dried out. also, i have read that it can be very dangerous for you water parameters if an anemone dies in your tank. so be careful about that too. has it shriveled up on you already? mine also would shrivel up every couple of days. i found out that they do that when they are getting rid of waste. hopefully yours doesn't die. i know that i am saving for the proper lights just for another one, i think they are awesome.