IceCap K1-Nano Protein Skimmer

I bought this skimmer to go in my innovative marine 25 gallon lagoon tank. It fits perfect and started skimming nice dark skin after about 3 days. The only issue I had and is why I rated it a 4 is it is pretty loud, but whither a quick mode with a small piece of felt and a small dab of the clear sticky putty it is super quiet. So the silence is louder than running it without it but still loud without silence. So I just added a piece of felt where the intake air goes in on the silence. Very happy other than the silence. Would definitely recommend this if you have small limited space such as all in one tanks.