what do you guys do with cracked tanks?

throw it out

flex seal man, don't you see the commecials?

I gave one to a buddy for a tarantula tank

Otherwise I toss em. The last one I cut apart and wrapped the panels in cardboard and put it in a dumpster

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I cut out the good panels and use them for tops in my fishroom. It is a good way for cheap glass. I have a glass cuting tool, and cut corners for air lines and food access, etc. Old cracked tanks are a good source of glass for the fishroom. Especially since you can bust out the broken side, and then carefully cut out the silicone and have nice pieces. Sand the sides so you don't cut yourself and you have excellent thickness for glass tops.

sell as reptile tank or give away for free on kijiji

Throw it in the trash and buy a new one.

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I would disassemble and save the glass. I'm a big DIY guy and I'm certain I'll find a use for it in the future.

I'm glad that you at least utilized it as a learning tool (practicing your glass drilling) and not just simply discard it.