Trust me, the green water WILL disappear, whether you use a UV or not. It's only a matter of time. It seems like set-ups with high enough light always go through a greenwater phase.
Speaking of atomic inline diffusors, mine sucks. It worked for a few months until it began to leak. The c02 would rather seep out of the cracks in the plastic than diffuse through the ceramic portion of the unit. =\
Maybe I will try out the ista max mix reactor.