Depending on the size of the vent I took a piece of ridged air line tubing and stuck it in the hole so it's 2" Above I don't get salt creep blocking my vent hole
I have mine 2-3" above and it goes into my drain like the glass holes. I guess I should specify my ridged tubing is RO/DI line not the standard airline used for under gravel risers. I have never had salt creep issue mainly cause it goes into the water draining down the pipe so I'm not getting splashing up into the tube