Wokyo Protein Skimmer External Mini Aquarium Filters Separator Hang On Back with IQ5 Aquarium Filter Accessory for Saltwater Fish Tank

This thing is the best 20 some bucks I've ever spent on my reefing. It is very simple, very small and skinny, fits in the back of my all in one which only has 2-1/8" of space. Fired it up and started getting skimmate with hours. Let it break in and in the following weeks it now pulls a nice dark skimmate. Huge bonus with this very inexpensive skimmer...it has a drain hole outlet coming out of the bottom of the collection cup! No kidding, I've got some tubing connected to it that I run into a plastic jar. Just perfect and I don't have to worry about the collection cup getting filled up or have to empty it very often.I've only been cleaning it every 2-3 weeks and works like a charm. Still on the original airstone after almost two months.I love this thing, really. Save your bucks for the corals and skip the expensive needle wheels for this size...