Hello, I have a seaclone 100 protein skimmer that I think is working fine but im not sure. It is foaming in the main chamber, but the collection cup seems to be filling up with some sort of dirty water. I dont know if thats how its supposed to work. Also, if it is working, then, isnt the skimmer taking out water from my tank, does this remove the salt also? I was wondering if I will have to fill up my tank again.