Here's the shape that I thinks works best. It's a $10 fish bowl. I don't use hoses in the typical way.
http://m.petsmart.com/h5/hub?id=supplies%2Faquariums%2Ftop-fin-artisan-fish-bowl-zid36-20825%2Fcat-36-catid-300065%3Fvar_id%3D36-20825
http://m.petsmart.com/h5/hub?id=supplies%2Faquariums%2Ftop-fin-artisan-fish-bowl-zid36-20825%2Fcat-36-catid-300065%3Fvar_id%3D36-20825