For what its worth, the UV should not disrupt your cycle. Nor did it affect mine. I researched this before buying one as it was early on when I made my tank move. Don't worry about killing the beneficial bacteria as a very small percentage of your good bacteria exists in the water column. And what does exist in the water column usually doesn't live long. Most of it resides in the rock, substrate, etc.
Also, just my two cents, when I had this issue, I already had a skimmer. An oversized powerful one at that. So don't expect a skimmer to solve this problem, although I HIGHLY recommend getting one anyway.