Ah ok, sorry. I misunderstood. Thats good then
Oh and just for the record, we tend to offer multiple bottles but how many depends on the pair/group sometimes. At the moment our pair have two and our trio have three, but at one time we had a group of four who needed six bottles to stop them squabbling over them lol
We don't tend to do two of everything anymore, but thats because we've learnt and adjusted things more as we've got more used to keeping pairs/groups.
Two entrances/exits and no places the hams can get trapped are the really, really important bits.
Our sand baths are about 15cm by 10cm, but its varied between pairs/groups a few times.