I'm so, so, so sad tonight. I did a full water change this morning (same water as always, dechlorinated last night, heated prior to moving the tadpoles) and they ALL died. Something must have gone wrong. Next time, if there is a next time, I will be hyper paranoid about testing water before I use it - the only thing I can think of is there was some change in ph in their tank before I moved them. I feel horrible about killing 7 happy healthy tiny little buggers.