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Very neat and good luck with them. As a kid I went to the ocean on the east coast. I saw lots of coolaid coloured jelly fish. I thought they were all dead cus they did not move....untill I saw a dried up dead one.
I am the worse for taking short cuts with water changes. But thanks to MARSH I am finally running a protien skimmer that works. And doing water changes if not ...almost to the book. I am not saying or implying anyone else did a water change short cut.
I just did a syphon and dump. Which I had done previously. This time I didnt syphon the gravel.
In previous times I syphoned the gravel, made sure the specific gravity was spot on. This time I had gotten complacent and not perfect. The jellyfish books say you should remove the jellyfish before dumping the water back in, which I never did.
I had also washed my hand and wonder if I had some residual soap on them.
Within 5 minutes the tank was bubbley and the very healthy two large jelly fish dissolved before my eyes. The smaller one had a hard time getting food from the two big ones.
Ya the dumping of the water probably did it as a guess. It is possible that the water you dumped in was too different from what they were accustomed to. As a suggestion you can try dripping the new water in??? Maybe drip it into the filtration to give it a good mix.