I'm about to install an Eshopps M on a 40g breeder. I'm also going to paint the back black. Should I do that before I drill for the overflow? I was going to do it after.
It doesn’t really matter, as long as you’ve masked off where any overflow or gasket parts will be clamped against the exterior of the glass!
(You can also scrape those contact patches perfectly clean with a razor blade later, either way, it’s labor intensive…)
