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10 gal tanks are not tempered, at least the sides are not. I have successfully drilled 2 ten gal tanks. one cracked and one didnt. I then siliconed another sheet of glass with a hole to the drilled panel to strengthen the side, since the glass on a 10 gal is very thin. both tanks, even the cracked one don't leak.
As far as the overflow question, I would highly recommend drilling the tank. I have a 55 with a HOB overflow that gives me constant anxiety. I've had it for 5 years and I check it every single day. I have had it fail twice a few years ago but have since learned the tricks to dealing with them. They claim the siphon tube wont catch air bubbles at the right flow rate which is correct as long as the tube is clean. Any significant algae buildup will negate this. If your return pump starts spitting out bubbles for any reason, these can accumulate in the siphon and cause it to fail. Also, these siphon overflows tend to make noise if that matters to you.
I will be drilling my tank very shortly and will silicone in an overflow box on the inside and out. My design is to silicone a external box thats the same height as the tank and has 3 bulkheads at the bottom, then silicone in a glass overflow box into my tank and drill two 1.75" holes in the glass with no bulkheads.
Thought I read somewhere most tanks 55 and under are tempered glass but I’m sure it depends on who makes the tank. Always best to check before you drill anyway. I know Aqueon will sub in tempered glass if they don’t have enough regular. Maybe it’s only the bottom.