Actually a Stichodactyla gigantea or Heteractis magnifica anemones would be almost a guaranteed host, because these are natural hosts for them in the wild.
**HOWEVER**
Something to know about Giganteas...
>They can sting non-clownfish and may even eat other anemones. Giant carpets unlike their relative the saddle carpet seem to be very difficult to keep in captivity. One of the reasons for the difficulty in keeping the giant carpets may stem from the fact that most are collected from very shallow water, sometimes less than 3 feet deep. This leads me to believe that it may be difficult for the aquarist to give the anemone all the light that it is accustomed to in nature.
Something to know about Magnifica anemones...
>They tend to move to the highest point in the tank, often up the sides of the glass very near the water return pipe. In nature they tend to be found at the highest parts of the reef exposed to strong light and currents. In the aquarium they will need very strong lighting (metal halide) and very strong alternating (wave) currents to do well. They also have a reputation for being able to catch and eat medium sized non-clownfish animals in the aquarium.
Taken from a report writen by a Phil C. Henderson.