i think it's fine. i wouldn't use a fish tank though, you're not
working with fish.
most of the notes i've read say that the Up are from "swamp - watery" areas. near creeks and such so no you couldn't have too
high humidity but you could have too LITTLE AIR FLOW!!!
you need ventilation, not from the top as there isn't any air movement unless you have a fan but still...room air into a vivarium is very wrong.
besides, how are you going to reach down and such to maintain the plants, dead crix, eggs, etc when you have a top only accessable tank?
build your self a front opening tank! study the landscape from which the Up are from, found and so on. don't build your water feature out of stone, plastic exo-terra junk or so on. make sure the edges of the stream are sealed so your soil isn't muddy, and design it so that the edges are also covered in moss. i can't imagine the pain one would go though to try and fix a broken jaw
on a Up. soft waterbanks are best.
we built a 30" long x 20" deep tank once with a waterfeature, plants, trees, etc for a 1.2 and with the front sliding open the maintenance was super easy! try it!

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