Jardinis also don't have the flexibility of some of the other aros, like silvers and blacks. They are one of the bulkier aros, so a wider tank is definitely in your future. You would be ok in a 125 for a while though but I went with a 150 over the 125 because it adds a little more height...other than that, I would say for a full size adult a 36" width would be minimum.