And standard 10 gallon tank dimensions are 20" long x 10" wide x 12" tall. So two together would be 20" x 20", which is about 1" longer both ways than what I have.
Ah, you mean 20" x 20" square, not side by side ("side by side" means the longest part of each tank is facing you, the shorter sides are next to each other and it would be really long, 40") so the short sides would be what you are measuring by. I KNEW that couldn't be that big or those are the biggest vegetables I have ever seen! I was also thinking of a leader tank which are 24" long, sorry we confused each other!
Okay, for a baby that size I think would be fine for at least a year or so, but later on you can turn it on its side and have a fantastic viv. Since the ficus is plastic, you can cut it into smaller pieces and still use it in the sideways viv. And if your baby likes the hammock and doesn't outgrow it, you can still use it.
And I figured that having a bulb in a protective casing and creating natural speckled light through the leaves would raise the ambient temp, not be too bright, but encourage basking as well.
I agree with Nythain about the light, don't bother with it. It is an added risk with not much benefit. Corns aren't basking snakes, they seem to prefer belly heat which is why most people recommend UTHs for corn snakes.
I was told it is good to have multiple heat sources and cool spots. There is a flat, hammock-like area on the top of the tree house to lay also, if she even ends up being a climber, which she may not. Many owners say they have some corns that hang out all day in the fake trees and others who never do at all.
For corns they need one heat source at one end and the other end would be the cool spot, a long tank would provide that which is why the longer tanks are recommended over the tall ones. If your room is the temps you say it is, just keep a digital thermometer on the warmer end to make sure it stays around 87°, there is not much gradient, but if she gets too warm you can tell, they usually get irritable. If you need a space heater you can always get one in the future.
Sorry for the confusion, this is why communication is so important! I love your viv, and want it to work for you, thank you for taking our opinions to heart. We mean nothing but help for you and Suke!