Can I Clean This Part 2

[Gocntry]

Ok, another episode of can I clean this or do I get rid of it.

I had a friend give me 2 glass tanks, they were used as aquariums, and were sitting outside for unknown amount of time.

There are now in my garage, waiting to be cleaned. One is a 55 Gallon, One is a 20 Tall,

Question is can they be cleaned for reptile use? Or are they not usable due to unknown fish / chemicals / substances that were in there?

Again if a little work cleans them up and they are usable Great, If they would still pose a hazard to house reptiles in I'll get rid of them.

Pics are attached of the used aquariums, they are not pretty.

I also have a 20 gallon terrarium, that was a freebie too, this one has a crack across the bottom (sorry no pic of this one), on one side.

My plan was to hot glue a piece of plexiglass over that half of the glass on the inside and make it the "cool side" and put a heat mat on the

unbroken side for the "hot side". Would the hot glue be safe after it dried and hardened?

I know to NOT use any form of tape in there, so that's out.