I looked around and haven't been able to find anything specific to my question, so I hope someone in here can help me out.

A local pet store had 40 gallon breeder-type Zilla Critter Keepers for sale for like, $75. So I thought "WOW that's a great deal!" and picked one up while I was buying feeder mice for my ball python.

In the next several months, I'll be gathering all the necessary supplies for a Pixie frog. Stupid me didn't realize that in teeny tiny letters on a sticker on this particular tank reads "Do not fill with water", or something to that effect. I don't want to do a return and exchange because it's just really really inconvenient. Do you think that I'd be able to put maybe 3-4 inches of water in 1/3rd of the tank if I use aquarium sealant to reinforce where the glass meets on that one side?

I've read other places that the glass and sealant isn't strong enough to withstand the pressure of being full or half full of water, but didn't find anything specifying whether or not it could handle the relatively small area of water that I want to put in.

Thanks in advance!!
-Emily