I called up Alex Adon, of jellyfish Art for some advice. He said the holes were do to lesser flow than necessary so I boosted the flow a little. The holes should be no big problem but the highly inverted, wreck ball, of jello is pretty much on death row. however, I have had three jellyfish live to see several more months after being declared done in by Jellyfish Art.
So I will try and get this under control and see how they do.