Protein Skimmer Help (leaking)

I got my protein skimmer from my LFS (not quite sure on the brand somewhere overseas) He is a pretty knowledgeable guy and has always offered me help so I didn't hesitate to buy from him. I installed the skimmer and it started to produce some gunk but never enough to push it into the collection cup. I noticed water coming from where the collection cup twists into the body and some white foam floating in my sump. I was wondering if this leak will cause me to lose any skimming production and to replace the seal ( I believe that to be the problem) or if I would be ok to leave it as is.