they can kinda climb up the corners, they cant "scale" the glass. even tho they're not the best at climbing glass they still can escape an uncovered tank
I have seen them trying to climb up the glass a couple of times and would only get an inch off the ground before falling off, that's why I figure it was fine without cover.
...my firebelly toad died and I dont even know why...it became kind of blind too. I took care of it though...
Sorry to hear about the loss. Maybe it died from old age.