I read it on some forum about cutting the propeller. Some people change the power adapter to reduce power.
The chiller works well and maintains within 2'C of the tank. Only thing is a few times when I do water change, the chiller pump gets stuck. I think because its dirty inside or the hose, I have to clean it soon!
The skimmer only produces skimate only if there is feeding. When I bought it, it starting skimming right away, but it wasn't the right setting I guess.