A few quick questions if I may?

First off, I just put a down payment on a ball & the tank I was going to use is my old fish aquarium. It a tall hexagon (24"tall, 12" per side & 24"at it widest point) Would this be ok to keep her in for a while?

I was thinking that I could just use the lighting that is with the tank or should I replace it for one of the single heat lights? The lighting I have now is a 24" 4 bulb corallife, it produces a lot of heat. The issue I forsee with this tank is being tall I am unsure if the heat will reach the bottom for a basking spot or just warm the air with either light set up.

I think the plus of being tall is the humidity wont be a factor, but just the heat issue is concerning me.

Thank you all for your time in advance!