I doubt there are too many folks here who will be able to respond, though I am curious how many do keep jelly's. From what I recall, jelly's require a special tank system...one that has circular flow and no corners...so a circular shaped tank as well. This was my recollection when I looked into it years ago. Of course like anything, I'm sure there is someone out there who will chime in and say they have had "great success keeping them in a small rectangular tank" or something like that