I had a racks like those. They are very heavy. They look like they wouldn't be but they are. They can hold a lot too. It should give you a weight limit on the box. But for just tanks of frogs it will be fine. The only problem with mine was I didn't have enough room to go into the top of my tank once it was on the shelf. So keep in mind you will need extra room at the top of each tank to get your hand in there for feeding and such. Also enough room to fit hoods or lamps. If you have tanks that have doors on the front then that isn't an issue.
Just something to keep in mind when you start measuring things.![]()