Hi, is a 29 gallon tank an good height/size (30.25Lx12.5Dx18.75H) for tree frogs (2 to 3)? Should i go with a 30 or 50 gal extra tall tank or is this fine?

What is the groups opinion on screen tank tops, not the flat kind a screen box on the top of the tank to get extra height. Would this this type of top be to hard to keep the humidity level in the tank or just stick with the flat screen top?

Thanks.