I've been building a faux-kreisel tank insert to experiment with... you could in theory make a really quick jelly tank by using one of those semiround large betta bowls, or by flexing a piece of plexi into a glass tank, to make it round at the bottom and use your filter return to create circular motion in the tank. the right balance can be hard to acheive though, you don't want very much movement at all, just enough to keep the jelly's off the bottom and top.