I have an Aqua-C EV-180 on a 120-gallon reef and I'm very happy with it, but wouldn't think that an EV-120 would be big enough for a 135-gallon reef. It would more than likely be fine if it's fish only...and stays fish only. In that event, I'd get a good amount of live rock, like 135-pounds, or maybe half live and half base to save you a good deal of money...and not use the DSB....WOW....I just realized that I posted here while doing a search for something and didn't notice the date of the last post...SO...what skimmer did you wind up going with, jd?