Just a guess but it looks like a new set up, diatom bloom still aparent, stock cube lights, damsels in there (just a guess, have been used for cycling)
Its prob not a good prognosis for your anemone you have in there right now. I think its no longer a matter of if, but more like when it dies be prepared to remove it quickly. To help further, look into upgrading your lights, let your tank mature more. Research anemones and learn about their care and needs. They all have specific requirements but as a general rule they all need high lighting dispite what LFS might be telling you. HTH Good luck.