PLEASE NOTE: We go to great lengths to treat, quarantine and remove any unwanted parasites, hitchhikers, and other organisms from our macroalgae. However, we do not guarantee that this item is completely and totally free of anything unwanted. This is because sometimes spores, eggs, etc. can remain viable but not visible, despite our strict quarantine procedure. As a result, we always recommend that you properly quarantine anything new that you are adding to your tank.
Quote from algaebarns website, so not sure if they would end up doing anything for me. And if I had bought anything new and added it to this tank I would not expect the chaeto to be the culprit. However all of the coral that I transferred over had been in my old tank for at least 8 months and then in a temporary frag tank for over a month while I cycled my new set up. Never had aiptasia in either system. I was also extremely careful in inspecting every frag I brought over as I was attempting to not transfer any vertimid snails that I had in my old set up.