I've found some really nice round glass cylinder vases that I'm working with that are similar to this size. I have one project that is a few months old with a colony of close to a dozen shrimp. I have a terrace set up in that one, which I think gives them a little space to spread out. I'm about to start a new one, maybe two, so I can seperate a few different varieties of shrimp. The one I have now is in the windowsill, planted with dwarf sagittaria, water lettuce, and hygrophila corymbosa. I am going to do another one with lace-leaf java fern and water sprite and try to get it to grow out of the top of the vase.