Yes, Stella had told me about it ages ago, and I'm sure I mentioned it after that somewhere. Not sure if it was here or somewhere else though. I have them going in my poly box pond things where I grow those plants to see if they can really clear up water. They should get heaps of food in there, and then I put them in the tank.
Apparently they can live for 30-50 years so I'll be interested to see if any one has actually kept them alive in a proper tank for ages.