Protien Skimmer Octopus 100

I bought the Octopus 100 HOB skimmer about 2 months ago works great up until it started filling up 5 times a day and the water level on it was about 1 cm from the top. Then it started overflowing lucky I was home at the time to prevent any bad things from happening. What is going on with this thing why is it overflowing????
 
I think I found the fix to this...There is a sponge in the one half of this unit I took it apart to get to that sponge and well it was covered and gunked up with so much goo which could have been preventing the water flowing look like this is working not since I cleaned it. Should I just leave the sponge out of the chamber?
 
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