The purpose of a kriesel tank is not just the corners, it also has a specialized type of flow. You don't keep jellyfish in tanks with high flow or bubbles as shown in that desktop tank (and definitely not with gravel or any rocks!)
They really are highly specialized animals and as a general rule will not survive long term in our standard tanks with standard filtration. If they get sucked onto a powerhead or intake they are goners...if they get in the flow of the return and knocked against a wall, in time, they are goners. I damaged many a jelly just by trying to clean algae, or siphon a bit, in a proper tank...
While I appreciate that they might have a better life for a short while, i also do maintain that buying these animals just proves to the store that there is a market, and so more are doomed
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
As hard as it is, sometimes it is best to leave these animals to die in the hands of the LFS, so they are discouraged from buying more.
Best of luck in trying this. Keep your parameters absolutely pristine.