I have the same exact problems however mine is a hanging one.
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!- stop the millions of air bubbles entering my tank.
2- the water level in the skimmer wouldn't rise unless I had some resistence on the output... like the water level was controlled by the output pressure.
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I am currently looking at different cheep skimmers as a test to see how they work in comparison.
In the end I will end up tossing the bigger penny and investing in a decent skimmer..
Over all the SeaClone hasn't impressed me. Kinda flimsy casing . .
Anyhow back to the topic, if there is a solution or user error please let me know. It may save me some heartache and cash.
mike_4_all@hotmail.com