Im no pro, but im looking at skimmers too, i found one its called a tubeless skimmer its about 180$ every review ive read has been great! I think i need a
hob skimmer though, as my sumps max water level is about 6 inches, its a tidepool 2. As for venturi driven its all air mixed in and chopped to catch the toxins and waste in the contact time within the body of the skimmer, and recirculating uses a more powerful water flow which in turn creates more micro bubbles, recirculating skimmers i do believe are bigger on the footprint side of things i may be wrong though