I have a log for my pleco to hide in. Yesterday both frogs were missing, I stripped the tank of all fake plants took the log twisted it and rotated it and found nothing. 20 minutes later out was a froggy. so I don't know for sure if the other is in there or not. they are very very good hiders. but there was a hole in the top of the tank about 1.5 inches squared. so it is possible he jumped out and disappeared. but that would have to be one talented frog.