Looks like that was intended to be installed before the tank had water in it. _That's_ annoying . . .
I should think that the weight of the light fixture would help to pull the assemblage forward, putting less pressure on the rim?
~Bruce
I'm thinking I need a spacer of some sort.
I already printed the return thing however I'm second guessing this.. i really like the look of this fixture. I want to make it work.