i have owned the vertex in180 twice and absolutely loved it, was just too much skimmer for my system, friend is running one on his 180g and few other on here running them on 120g plus tanks, also owned the in100, and 22 or so other skimmers, if it is fish only tank id go with the vertex, easy to dial, pulls 840 lpm of air i do believe and a solid skimmer and not bad priced new either