This is a very awesome site you have stumbled upon in regards to ball python care.

I do think you need a little bit of work on your husbandry from the sounds of it.

There is no rule saying you can't house the snakes together but I wouldn't suggest it. If one of them gets sick, they both get sick. They are not social animals and receive no benefit from having a cage mate.

You need to get the heat pad and the TAPE out of the enclosure. Ball pythons can be seriously injured by tape. You UTH should be outside the tank and should be controlled by a reptile thermostat to prevent burns. Burns can happen at temps as low at 95*F.

There really is no need for the extra tank on top. Ball pythons are terrestrial snakes which means they are very clumsy climbers. For the big snake, it could actually be a bit dangerous if it fell. If your snakes are climbing a lot then they are probably very stressed out.