Forgive me if this is a bit long winded, I'll make this as short as I can while keeping it understandable. I'll give you a bit of background and then get to my questions

I got a tadpole about 2 months ago from work (work at a petstore, we get things from our supplier in occasion that we can't sell like crayfish, tadpoles). We had no idea what species it was, though we assumed it was probably a species native to some part of the U.S.
He has since changed into a frog, and he has been doing well. My best guess is he is a variety of leopard frog. I can try to get a picture of him when I am able.
I know the tank he is in currently is not ideal, but I'm hoping to change that with a bit more know-how.
He is currently in a 10 gallon aquarium with a gravel bottom and filled a bit over half full of water. There is filtration in the form of undergravel and a simple activated charcoal filter. Water gets patially changed every week. The only land it has currently is a turtle dock. There are some live water sprite plants and he gets a basking light. The lid is a glass aquarium lid that has been modified for increased air circuation. He's starting to get big enough to eat small crickets as well as his fruit flies.
This was never intended to be long term; he started his final leg of his metamorphosis (where I needed to make sure he could get out of the water) right after I had surgery so I have been unable to afford a better set-up as well as physically assemble one.
I suppose my big issue is that I'm finding a variety of information on their care. While it seems the more talked about set up has more land and a small area for water that is usually a container that you can take out to clean, other places just seem to say 'make sure they can get out of the water and bask'.

So, for the part about questions and help: I am planning on upgrading him to a long 20 gallon aquaruim, and would like to keep (if at all possible) as much water in the tank as possible. The main reason is because in the winter the air in the house gets really, really dry and I feel that having an area that acts like the aquarium he is in now will help keep that a bit more stable
Would this be a good idea or not?

- Is a metal screen lid better than a glass lid? I remember as a kid someone trying to keep a wild Leopard frog and it's nose got all scuffed and bloody from hitting the mesh screen.

-Does he -need- UVA/UVB? I seem to come across anything from a 'a little is fine but not needed' to 'it's bad for them and stuff'. Just wanted some clarification. I know he's probably getting little to no UVB now because I read glass filters it out.

I think those are my main questions now. Any help at all is greatly appreciated!

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