Snakes really shouldn't be housed together! For a few reasons;
1.) if one snake gets sick it is VERY likely the other will become sick as well. It could also happen if they were in separate tanks, if you held the sick one (without knowing it was sick) and then immediately held the other. Or held them together. But it's almost a guarantee that both snakes will become sick when housed together. Then you'll wind up with double the vet bills or two dead snakes.
2.) if you notice sickly looking poops in the tank, indicating that one snake has become sick, you won't know which snake it came from.
3.) snakes, and other reptiles, do not have a part in their brain that creates emotional attachments. They don't see each other as friends or company. They just see each other as competition. So there is absolutely NO reason to keep snakes together, other than the fact that you like how it looks, you don't have the space or money for two separate enclosures and supplies, or YOU just want your snakes to have a "friend". (or you are trying to breed them but that's obviously not the case and a whole other story)
4.) the biggest concern with having two snakes together is CANNIBALISM. Especially with colubrids who are very opportunistic feeders and aren't afraid to try new foods... You could be feeding your snakes and one decides it's still hungry... It won't hesitate to attempt to eat the other. If one snake is bigger it would be most likely to eat the other, but I've also seen smaller snakes attempt to eat their bigger tank-mate. In both occasions, both snakes can die. And it would happen so fast that even if you were watching them 24/7 and never moved or took your eyes off of them, one snake could still grab the other faster than you could react.
5.) adult corn snakes need a 20-40 gallon tank all to themselves. So when both snakes become full grown you'll need AT LEAST a 40 gallon tank, but more like an 80+ gallon.
6.) if the snakes end up being opposite genders, and are still together when they reach sexual maturity, the male will continuously mate with the female until one or both die. I have seen this happen once, with a ball python. The act of continuously breeding used all the males energy (and I believe he was refusing to eat as well) Until he was stick thin and eventually died.
I will say, some people have kept their corns together for YEARS, even the snakes whole lives, without anything bad happening. Those people are very lucky. But in a split second things could go wrong. So I would really consider whether you want to take the risk....
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