One thing to understand about anemones is they are not reef creatures. They are found just outside reefs and in lagoons mainly. Most coral species have no real defense against their often powerful nematocysts.
Many types of hardy soft corals are fairly resistant to anemone nematocysts for short periods, some will even withstand it for weeks. It really depends on the species, Sinularia's are quite resiliant. I would highly recommend you run the tank with carbon when keeping anemones and strong chemical polluting soft corals. The corals will shrink back away from the anemone but once it moves on most will "rebound" back to normal in time. None will withstand it permanently. If an anemone is to be introduced, preference of placement and care must be in their favor if the anemone is to do well.
As a general rule, anemone's will wander some when first introduced to the tank but once settled they shouldn't move again unless something changes in the tank. As long as water flow remains constant and light intensity/spectrum doesn't alter much, they should stay put. They wander becuase their needs are not met or changes are made.
One thing to very strongly adhere to is be very very sure the tank is stable and matured for some time. Some will say 6 month is sufficient but 1 year should be the absolute minimum IME. Personally I won't introduce one to a tank until about 1½-2 years. I would also highly suggest finding a clone/tank raised animal. They are far easier to adapt to new surroundings. The collection and transport practices of wild caught species leaves much to be desired. Your success rate of a clone vs a wild species is about 10 to 1 if not more.
Was your main goal a hosting species of anemone or purely decorative?
Cheers
Steve
