I have the BH-1000 on my 38 gallon reef tank and it is excellent. Pulls out lots of dark green gunk a couple times a week. Nice and quiet, and not bad-looking either. If you have to go HOB, like me, this is an excellent choice.
55 gallon reef tank. AquaticLife 4-bulb T5 HO with 4 LED moonlights. Reef Octopus BH-1000 HOB protein skimmer. TLF Phosban Reactor 150 running 400ml of NPX Bioplastics with a Maxi-Jet 1100 and a BRS Reactor running activated carbon with a Maxi-Jet 900. Vortech MP10w.