will Yellowtail Damselfish attack my anemones?

It is very doubtful. You should not have a problem with Chrysiptera parasema, except toward other fishes, especially other, more peaceful damselfishes.
 
I have a yellow tail damsel. It's the first fish I ever bought (4 years ago now). I've had various BTAs in my tank and other species of anemonies. The damsel never went near them.
 
According to both books i've got here, the yellowtail damsel is excellent in reef tanks, but can be territorial.
 
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