Gray Treefrogs Disappearing!

[Kurt]

To eat each other, they would have to be significantly different in size. I would replace your top, which sounds like a standard aquarium top, with a screen top. Tree frogs require good ventilation and they are not likely to escape when there is a screen top in place.
Just to clarify things, the sand is under water right? Posting pictures of the enclosure will help a lot. Also posting your country and location in your profile will help even more in the long run.

[Sere]

Yes, the sand is under about 6 inches of water. They're all practically the same size, so I guess that rules out eating. I'm trying to find a top for my 20 gallon tank, which is all I'm waiting for before moving the frogs in (it's a more land-based tank, with branches and whatnot for them - they're really just stuck in the tadpole tank right now). Unfortunately, none of the 13 pet stores around here carry ANY tops for 20 gallon tanks for some reason unless you buy it with a new tank.

I don't have a camera to take any pictures, but I can "draw" the only openings on the top for you. This is pretty much accurate size:

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I can't imagine them squeezing out through that. The only thing I can think of is that they're burrowed in the sand, but again I haven't seen anything that suggests that's possible, and I would imagine they'd drown after staying underwater for 2+ days.

Also, I'm in central Virginia.

[Kurt]

I severely doubt they are underwater. Most likely they have escaped. Petco and Petsmart both sell screen tops. And you can get them on-line as well.

[Sere]

None of the ones in my area do. I've checked four Petsmarts and 3 Petcos. They say they don't carry individual tops. Where's a good place to order online?

[Kurt]

Trust me they do. Petco has their own brand of tops. Look in the reptile section. Or here - http://www.petco.com/product/4357/PE...t=OnSiteSearch

[Sere]

I have. The manager has told me they don't carry those here unless you buy it with the tank. They only carry 10 gallon, 30 gallon, and 40 gallon lids. None fit my 20.

[Skulldroog]

I have. The manager has told me they don't carry those here unless you buy it with the tank. They only carry 10 gallon, 30 gallon, and 40 gallon lids. None fit my 20.

That's just horrible convenience. Usually when I'm looking for something at PetCo/Petsmart and they don't have it, they usually offer to order it for me and call when it comes in.

Good luck finding your frog.