Review on Tunze Comline 9004 DC Protein Skimmer by Christine Noland

This skimmer is absolutely silent. There is some noise from the air intake, but it's no louder than HVAC. You have to be near him to notice him. The control knob is sensitive and easy to use. I soaked my 72 hours in vinegar and tap water before putting them in the tank. Look for the waterline printed on the back next to the top magnet to make sure it works right from the start. I had no microbubbles and while she was still digging/filling she pulled out black water in an empty tank for 12 hours. Compared to conventional cone skimmers, it skims wet. I've used expensive HOB filters and this thing is way better in terms of noise, skimming and ease of use. I was planning to drill a drain fitting into the water collection bowl but on my Nuvo 40 AIO the bowl is under glass so this is not possible.