Normal
I did have them in a 20x15x15cm enclosure but I thought it may be too big for them at the moment. 2 stayed together and the other 2 went off separately. I did read that this can lead to them establishing territories and could cause problems so I’ve got them in a much smaller deli tub at the moment. They seem more than happy and as you say, have made a web house and live practically on top of each other.