I'd say the Coralife skimmer is okay if you can get one cheap. I bought a used one (essentially free as it was a package deal with a light fixture) and it isn't bad. It does skim a nasty dark green stuff out of my water. It runs well as long as you have a constant water level and clean it every 3 to 6 months. But I wouldn't buy one brand new. As others said you can get better skimmers in the same price range.
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