I have had a 1.1 in a 10 vert, a 10 regular, a 20 vert, and now a 15 vert. I have had them breed in every viv they have been in. I do like the bigger vivs because, I think, they seem more active and happy in one.
I have my established pair in a 15 now and wanted to try a 1.2 so I added an extra female. The females fought for about 8 hours one day and I couldn't take it anymore so I split them up.Now, I have 5 in a 20 vert but I haven't noticed any agression between any of them.Two of them look to be males so when one starts calling I think all hell wil break loose.Time will tell I suppose.
MW