I don’t think the light is strong enough based on what I’ve heard but don’t have experience with Fluval lights so can’t say for sure. How established is your tank? It should really be 6 months or so before you add an anemone unless you really know what you’re doing.
Not related to the nem but your tank is really cloudy, you should see why. Could be something lik bacterial bloom (mini cycle) or stirred up sand, but better safe than sorry. Plus it will look better