I was thinking of a UV aswell, however it raises several concerns.
1) With a DIY inline reactor, a 5# C02 Cylinder, and my XP1 all under the same tank; I have little if not no room for a UV down there.
2)The UV I have been considering, the Turbotwist 9watt by Coralife, is rated for a flow of, if I recall correctly, 100-150 GPH. Well . . . my Xp1 pushes out much more than that . . . blah!