Clowns and Fake Anemones'/Arrow crab and clown's
 

Will Clown fish use fake anemone's?
Oh and was also wondering about a arrow crab eating these clowns
there small mabey 1.5-2 inch's and the crab is about 7 inch's from tip of leg to tip of leg (about the size of my hand)
and the clowns seem to be hanging around the crab,
Should i be worried about these clowns becoming a light snack?

I would guess that a clown would not host in a fake anemone, and I doubt that the arrow crab would catch one of them for a snack. I had a coral banded shrimp with 2 clowns in my 30g tank and there was never a problem, I think coral banded shrimps are more aggressive then arrow crabs. Sorry I don't have any real experience with your questions, that's just my 2 cents.

Bump.

i heard fake anemones live for a very long time

I had an arrow crab in my 75g with 2 clowns. One of the clowns was quite small, It never was, and I wouldnt think that it ever would be, an issue.

Yes, I think they do.