As a general rule, how tight should eyeball return fittings be? I have one that due to how close it is to the surface of the pool I can visually see that water is escaping around the edges of the collar, and can confirm that by feeling with my hand that there is a decent amount of water (and air bubbles at pump startup) being forced out sideways and not through the exit orifice itself. But the collar is already so tight that I can't even reposition the eyeball without using a screwdriver or similar to move it, so it seems like it should be sealed. Should return fittings use a sealant (teflon tape or silicone lube) when installed, or is that even an option for a submerged fitting and they just need to be cranked down tighter to seal them up all the way?