About those down-heading jellies... that's what they do in this aquarium. They've been doing this every time I've seen them. I think it's either - they do this in the wild but we never see them do it - or - the aquarium generates a current that attracts them in this direction. In either case they always perpetually swim down from the top. I wonder myself how they manage to get back up there and we never see them. There must by another route up. Ann