I just spent two hours putting together my canister filter. One the book how to put it together does not help at all! So finely got it done. I had the bio balls and rocks on the bottom, charcoal on the next try and because I was told here some round scrubby balls and then toping it off the white filter pads. I had to manhandle the green hose on to the pipes. My problem is after adding that spray bar it won't fit snug to the glass seems the elbow is too long, next there does not seem like there is a lot of water spraying out here I thought I would have to worry about blasting the fish. And I filled the filter with water closed it up and turned it on I had to pump it a couple of times and than it started to work I saw the water through the lines. Now I see every once in a while there's air in the hose and you see it blow out the spray bar. I thought after an hour of running all the air would be out buy now, is this normal? Could it be that the bio balls don't have a white filter pad toping them off like the other two? Should I worry about air in the hose?? Sorry about all this I know nothing about this filer