Any1 out there keep fresh water crustaceans??? Like in a bio-tope aquarium especially devoted to em??? I bought 13 australian blue crawfish called Yabbys to help clean up food left overs. But, then i decided to put them in a forty gallon short all on their own with a few dorads. In least than a few months they all disappeared!!! What happen to em??? Did they molt and dissolve away??? i know the small Dorads did eat em!!!