one wonders if perhaps there were mites in the tank, if Xien is so confident, however aquatek has stumbled upon a natural predator? That is probably really reaching... I wonder if anyone out there is maintaining a breeding population of these things in order to test hypothesis such as this... (I guess feeding them acros could be a bit expensive unless you have a huge collection and are willing to rotate a few in and out... (I wouldn't be. )