@Rostato I have a used Jelly tank that we might want to sell. PM me if interested as I do not want to de-rail this great thread.
We gave it two tries to have jellies and did not have great luck unfortunately. They were cool and great to look at when we did have them. The Moons would eat and survived a few months and started to shrink until they dissolved to nothing. I believe the pH was lower then I thought in the tank (no Apex on that tank) and this was was the cause but not sure. Then almost 4-6 moths later we tried again and had the tank cycled and parameters were where then needed to be and tried again with not a moon jelly this time, but a Violet jellyfish by quality marine and they were really cool and were less expensive then the moon jellies and looked cooler. Unfortunately they were damaged in shipping so then did not last very long.
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When I ordered the Moons they were around $200 for three Lg and the Violet were under $100 for all three