Hey! Beautiful lizards, you should get them individual enclosures if you can. While sometimes bearded dragons can get along, most of the time, they will end up fighting eventually, and it can get very dangerous. Also, not just the fighting, if the lizards don't have enough room they can get very stressed, which can cause pretty dangerous situations like under-eating which the skinny lizard in this picture I'm afraid may be experiencing. The thinness problem that this dragon is experiencing is also very likely a product of the size/occupation of the tank because even if your lizards aren't fighting to the death visibly they 100% for a fact are fighting to the death through resource hoarding. you see the way the 2 in the back there are on top of each other, it may seem like they are cuddling but they are actually "fighting" for the light/dominance and the 3rd lizard in the tank seems as if it has already decided it lost the battle for any kind of resource or dominance. Please move them into individual enclosures as soon as you can and if you can't afford to I genuinely would recommend selling 2 of them as living together for too long like this will certainly result in the death of your dragons.
