Ryan - I have four big and four small (one seems to be a loner and doesn't associate with the rest), tank is 1.5m X 0.7m X 0.6m.
Phoenix - I might consider downsizing (if Dave's sis doesn't end up wanting hers then you can have them)
Ron - I thought it might be a pair but I've checked multiple times and no eggs or wrigglers, but I really don't think a mix between an Electric Dream and a Blue Diamond would look good anyway?
I thought maybe they had worms so I poured some Prazi into the tank after the waterchange and now no one's happy. And no one's poo'd out any worms - so I know it's not internal parasites