OK, now i see what you are asking.
aiptasia are not an anemone you want to be keeping. they can quickly take over an entire tank. they can start to sting your other corals and cause these other corals to die back. aiptasia are one of the two most common pest anemones. the other is the mojano. a much more attractive anemone, but still can be troublesome around your purchased corals.
the reason the UV is used in that other thread was to kill the anemone bits before they got back into the display tank. in that thread someone is trying to grow aiptasia in an overflow/sump. aiptasia can spread by various means, one of them is through fragmentation. the UV sterilizer is used to kill any bits of aiptasia that may be floating around in the sump/overflows before getting back into the main tank where all of the corals are.
as long as you are not trying to keep aiptasia as a pet in an area, than you do not need the UV sterilizer.
OK, lets put our thinking caps on for a second. lets buy a $300 UV sterilizer to keep a pest critter.
G~