Need advice on red eyed tree frog

[Gonzo88]

I couldn't find my grass snake in the large terrarium but here's a pic of what it looks like

[ColleenT]

i still believe they are all better off separate.

[Gonzo88]

i still believe they are all better off separate.

If I was to put the frogs in a different tank, what dimensions would you recommend? Remember I'm still new to owning red eyed tree frogs