aquarium question

[qumqats]

hi,someone local is selling a "terrarium"
it is 40 gallons,all glass, 1/4" thick,with screen top.
> . . . snip . . .

"terrarium"s ususally have thinner glass, so thin in fact that they may break if you fill them with water.

That's why they're called terrariums, not aquariums!

1/4" doesn't sound thick enough to withstand 40 gallons, DON'T FILL IT WITH WATER!