Interesting indeed. My only thoughs would be a big bristle worm, but that is huge!!! I have a rather high snail mortality rate as well (I add about 20 snails every 8 months or so), so perhaps I am having the same problem as well.
I would not have thought that possible, but my LR is Fiji also, and if this worm has been hanging around for two years, who knows?
Good luck, and keep us updated.
Jason
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