How long ago did you purchase the Aqueon 40 breeder? The reason I ask is I called Aqueon and they are not selling non-tempered glass tanks for the next year plus. There are no tags on the tanks. If you didn't verify that it is non-tempered, I would make sure it is before you proceed any further since you drilled it. The warranty is now voided, fyi. See videos on youtube for how to check. I wanted to get one too but will probably go with another vendor to be on the safe side and pay to have it drilled.
I got the 40B last year. Someone was selling it "New in box" on FB Marketplace. So I am not sure when they got it though. And of course if it's tempered, you would see my crying here ..
I was very nervous when I drilled earlier. But having the plumber putty and taking it slow (40mnt) seems did fine.