Are they just not that hardy or am I doing something horribly wrong? Every other critter in my tank is doing fine...even the otos from PetsMart (yeah, that's right). My RCS are fine, my pygmy corys are fine and my harlequinn rasboras are fine. My CO2 is constant. The only thing different about yesterday was the fact that I did a rather large wc. Are they really sensitive to things like that?