jaredt,
are there any local reefers in your area?
what size bulk head are you using?
its the pump input tubing correctly level with the glass?
is the gasket on the correct side?
check the pic, if the longer piece is inside, the gasket goes outside and the nut goes inside, right?
and no, don't use silicone on the bulk head, they are intended to be use by themselves, and always hand tight it only,
putting it internally, will not solve the main issue you are facing, which is bubbles when the air valve is close,
whats this "the male one inch slip to 3//4 thread"?
sam