Marginated tortoise climbing

[Pocket squid]

Hello, I have two tortoises- a six month old marginated and a golden Greek. They've gotten along pretty well so far (I've had them for about a month and a half. The marginated likes to climb a log in their terrium and usually flips over (I'm usually there to help him though) today I noticed he was pacing the walls of the cage and would try to scrabble up the wall. He has never done this before and I'm wondering if he is stressed out? It is a glass terrarium so I have put paper all along the back and halfway above the sides and front. It there anyway I can stop this?

 

[wellington]

First two different species should never be housed together, that besides stressful, can be sickly to one or both. Second, tortoises should never be kept in pairs, again very stressful.
What size is the aquarium? Besides the above needing correcting, I'm going to guess the enclosure is too small for one, let a lone two.