Disclaimer: I printed this in PLA which is “biodegradable” I put quotes because it takes a very long time, but that being said these will have to be replaced at some point, as which I'm sure you'd want to do anyways.
EDIT: I added a rimless variant that has a 6mm gap so technically should work for upto 5mm glass safely but was designed for an Aqueon I own.
I started off by shortening the gap of the bracket by 3/8" or 0.375" because it was too wide for my 10 gallon and the screw by ¼" or 0.250 (1/8" or 0.125" less). because it needed to be a tad longer an 1/8" would have saved me here. but If I shortened them both the same I would still not be touching the tank.
I then realized the pot was rotated out of canter by 5 degrees and had parts of the bracket extruding past what should be an open flow. So I fixed the geometry to make it as open and undisturbed as possible.
One of the walls near the slot was too thin to print properly so I made some extra locating geometry, cut that part out, and rolled the edges back.
I checked the thread size its "5/16-18UNC Class 1B" Id suggest if that bothers you print another SCREW to use after you open that hole up, or changing the threading to "¼-20UNC" which is a standard camera tripod screw(you could use that to form threads) in the soft plastic without a tap, but they were tough to start and I had to use pliers to thread it in, but then it was fine. Id maybe suggest tapping that hole!
Below is examples of rolled edge and locating geometry:
I also exported the STL's in the correct orientation and singled them out so its not one file.
Any comments are welcome, I included the Fusion360(.f3d) file after I've made my modifications. I also only used math so all original parameter exist(I just subtracted 0.375")
The author remixed this model.