On the Coralife Skimmer I agree with what Tony said. They are really touchy. They can overflow any time there is a water fluctuation. I myself have had three small floods from them. Luckily I was home when it started. If you do use it as a hang on it is best used on the sump with a auto or some kind of top off system to kepp he water fluctuatoins at a minimal. Also after every water change you should readjust it and check them frequently. They are best used as a in sump skimmer.
Chris
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