Red Sea seal question

[Hannible123]

Hi, I bought a 2nd hand Red Sea 350 that has been running for 3 years and saw that that top right corner seal has a bit of air - is this going to be an issue?

 

[Big G]

Bump

 

[Tang22]

Yikes. I'd think if it were to extend to the edge I think you'd have a water leak.