yeah it's possible, but you'll have to be on top of the water quality like there is no tomorrow...... I guess that's just like everything else when you move a tank though.
as far as tank size goes, the only thing you need to worry about would be the anemone stinging something and killing it. bulb tips don't get very big when they are in tanks, I think something like 10-12" max.
The only thing I would worry about(and I have a MGB clown that was in a 20g with an anemone), is that the clown is going to get really mean after it post up in the anemone. so if you have any other fish, that's just something to think aboutsince they will be in such close quaters.....