need HELP! will my fish and inverts coexist?????

hey guys
i have 4 damsels, 2 false percula clowns, 1 flame angel, 1 sand flounder, and 1 panther grouper. none are over 3" long.
they are in a prestine 55 gallon aquarium with a live rock reef.
however, i just had to buy a orange tree sponge and i have a perfect place for it with strong water flow and little light right under a overhang in my live rock.
i have several turbo snails and hermits.
BUT with my recent purchase i was up for a free gift and i chose a "pink tip haitian anemone" for some reason i feel mischievious for choosing it beacuse i wasnt 100% sure it would coexist well with my fish and other inverts.
i need an honest opinion on what i should do since i have never had an anemone before. i just thought it would be nice for my clown fish. P.S. i do have awesome water quality and great lighting for it.
what should i do?
keep it and try it out see see how it goes or should i sell him to my local fish store and get about what this value is worth?????????
thanks
i feel like an idiot for even having to ask.
 
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