I'm a big fan of the reef octopus, and personally use the 110INT which would work good for your tank and your space. Their customer service is great as well. I had a issue with my collection cup, the unit was nearing a year old, I emailed them and sent them pictures and they sent me a brand new collection cup free of charge no questions asked. https://www.bulkreefsupply.com/reef-octopus-classic-110-4-in-sump-protein-skimmer.html