I`ll be getting another 20 gallon long soon and I know that they shouldn`t be together but lots of folks put them in together and they do I encounter each other in the wild so for now it will have to do. There is enough perches in there even now there all separated other then 2 greens on a log together. They seem happier than when the greens were in a 5.5 and the greys were in a 2 gallon hex for one night. I own

3 20g longs
2 10g
1 55
1 40 gallon breeder
1 55g
1 2 gallon hex
1 20g
1 5.5g

tanks I plan to get 3 exotera terrariums and onme more 20g long for my experiment. When I buy the whites this weekend I am getting them and exotera.