How do aptaisia spread?

[Joe Reefer]

I think aptasia can swim around in the water column.

[mark]

I've got my sump in the basement up on a stand and it's almost a second display for me. Thinking of using aptasia as a filter after reading Calfo and watching the sump video, but neither one really deals with keeping them out of the display so never did. http://http://www.reefvideos.com/ree...4_content.html

I've got them now in the display anyway and not much luck in eradicating them, would really be hesitant to add them to a system if not already there.

As for UV units, never used them, are they designed to handle something like aptasia?