Casey,
I was just at the NEAq last week with a friend of mine that is a diver there and he was giving me the entire tour of behind-the-scenes and we came across their jelly tanks. He even stated (if I remember correctly) that he had built these tanks in the past. They are contructed out of acrylic and they can't have any surface that would snag a jelly. I have attached a quick drawing of what I remember. I hope that this helps.
Let me know if you have any questions.
Take care.
Jamison