I haven't read this entire thread, just stating my opinion. That tank is too small for four snakes, especially ones that size. And even if you haven't had issues in the past, it's always best to house everyone separately. I've seen a lot of people use the argument "well they cuddle in the hide together, so they must be friends!" That is not the case. They're only in there together because that's the ideal place to be, the extra bodies are just in the way.

All of my snakes are housed separately in terrariums until I get a rack system built. I wanted to start mine at the beginning of this month but was delayed. I'm anxious to get the ball rolling because five terrariums take up a LOT of space!