I believe I have sealife skimmer that i bought used it has no water line that i understand many do and I am having a real problem with adjustments. Were should the bubbles start at the bottom of the canister tube? the top? PLEASE HELP I am having to empty my trickle can daily sometimes overflowing.... also does it matter if the water flow coming back out the skimmer is submerged or should be pouring out?? Thanks