Well there's no such thing as a dumb question it's all about learning. But if your running a pipe down into the sump you should put a shut off valve so your sump doesn't overflow when your power shuts off
If its not drilled yet a hob overflow would work. I mean the opening of the tube is at the top of the tank. If it was at the bottom the tank would drain until it got to that point.
When you drill the bottom of a tank you put an acrylic box around it. It will only drain to the top of the acrylic box. My 75 only drains about 3 gallons of extra water to the sump when I kill the power to the tank.
Ok so now I'm confused, I've been told you drill the top of the tank. I've read a lot about overflow boxes being loud is there a way to prevent that? Is there anyone who can send some pics of your drilled tank and the plumbing to the sump. Even if it's not drilled I like to see the plumbing from overflow box too. Anything will help. Thanks.