I would stay away from Nyos for two reasons, first (unless they updated it?) the pump is under powered and has difficulty restarting without help, second, too many parts to clean/take apart for maintenance. A skimmer is only as good as the pump, so look for something reliable and make sure it's a simple design. I always hear good things about Reef Octopus skimmers, but I'm a fan of Tunze and Deltec skimmers, they just work. Maybe look for used ones?