the only pipes i'd try with a carpet nem would be flagfins (genus Doryhamphus) since they're swimmers.
I most definitely would not put any sygnathids in a tank w/ anemones let alone a a carpet anemone. Carpet anemones are the most aggressive kind of anemones there is. My LFS "All-Reef" doesn't even sell carpets because they are not reef safe.Happy Reefing