OK, so I've got the 286 litre terrarium, and there are 2 more parietalises on their way. These are stil young, so the female will have to wait a little more
I now spotted another ad with a 2 year old male (the female might not have to wait a little more! And, as if that wasn't enough, a beautiful young Natrix Maura. I have got anough terrariums to keep them all separate (got to do that anyway, quarantaine etc.), but is 286 litres (130-40-55 cms) enough to keep them in together? It would be a very nice sight.

I've been assured that you can keep Natrix Maura with thamnophises, provided they're about the same size.