Corallife 300 cone skimmer

[scuba ken]

So I have a coral life 300 cone skimmer, that works lovely for about 3 days, but then just flows over and floods my sump.

Looking for reasons why guys ? The tank is 12 weeks old, I have no clue why it's doing this, I have never seen this before on any other tanker any other skimmer, the water level know is set to its lowest, the 2 air screws are open, closed, in between and all other settings.

This just blows gallons and gallons of water through the collection cup.


I am quite prepared to return this, I just don't see howit can be so wrong,mthere is nothing really to it mechanically ?