The remora's are either rated up to 75 gal or 75+ (pro) for the hang-ons. The EV 120 is up to 150, not sure of the specs for the 150. I always like to have as much skimming as possible so I would vote for the 150. By the way, you can DIY plumb the EV so it does not have to sit in your sump/ wet-dry