I have a brownish\yellow carpet anemone pretty sure its a Stichodactyla the kind thats sometimes artificially dyed, dont buy a dyed one tho. It is the less "sticky" varity of the carpets from what I remember and is less likly to catch and kill fish.
I keep him in a 55 gallon, 2 T5s, 108 watts total, he has been there for 14 months now doing fine. I forced my my two perc clowns to host him after 12 months I got tired of them ignoring it :inlove:.
Anyway these anemones likes sand, so I put him on the bottom and piled a few small rocks around him and he stayed there and has never moved.
I am not sure if maroons like these tho.
You can get them to go where you want sometimes by turning out the lights for an extended peroid of time and shinning a light from the side, they will move to it and hopefully lock themselves there.
Drop whatever you get where there is low flow and have the lights on and maybe it will stay.