Protein skimmer: Collection cup problem-need help.

[Bloodasp]

Well if it's new it will take some time for it to loosen up. I have the vertex IN-180 which is a bit bigger than what you have. But i think there is no difference in design just the size of the skimmer. It was a bit tight when i first got it but eventually much easier to take off now.
If it is a used one probably do what was suggested above.

[snow1]

It was used, came with my tank. It will only be used until I buy a bigger one.

[snow1]

Okay so I got a off a few days ago, just thought I would update...