Joining two tanks

["Red-eye"_Matt]

We have a 15 gallon tank that we were planning on using for our upcoming purchase of another red eye tree frog. While I was at work today my supervisor told me that he has an extra 15 gallon tank that I can have as he is getting rid of it because it has a slight crack in the top corner and can no longer be completely filled with water (this guy is CRAZY about his fish).

I was wondering if it would be possible to connect this tank to our current 15 gallon. I was thinking that I could seal the crack (it is apparently no longer than 2 inches) with some aquarium safe silicone, and smash the bottom of the tank out. I would take the bottom frame off first and cut off the pieces of glass that don't come off on there own. I was thinking that I could than just remove the top frame from off of the unbroken tank and join the two exposed ends of the two tanks using some more silicone.

Has anyone tried this or have done anything similar? I am looking for some advice on it as it will be a new thing for me to do and I wanna make sure that it will work before I start smashing things (even though that is half of the fun).

Thanks for any input.

Matt