Any time you put an anemone in a reef tank you take a chance. Having said that I have 4 in my reef( a BTA that split twice and a Heteractis Malu). They could
wander and sting other corals or vice-versa. But as mentioned most of the time an anemone will settle in a spot it finds suitable. Continued wandering is a sign of incorrect conditions, whether it be light, water quality or a combination of factors. Adding the anemone first, and allowing it to settle is the best option.
Originally Posted by chris stephens
but I've noticed it is growing huge and is getting near my fiji leather
You could frag the leather if it is large and healthy enough. But be aware that sometimes anemones will "over inflate" if they are not receiving the right amount of light, or if water quality is bad, trying to capture more light/energy by increasing their surface area. LTA's are high light anemones.