I have about 15-20 left out of 30-35ish. They were doing really well in their bucket, even with water added. Then they got put in a tank with an airstone, and some dropped away. Put a filter and heater in a few days ago, and since then 1 loss this morning.
They seem to deal fine with being mistreated and neglected (i.e. left in a bucket with no heater), but start carking it once you take care of them. A little too much love perhaps?
Mine are all a grey/creamy yellow, and my biggie is a female, so i'm yet to see any fab colours or big fins. I quite like the yellow colour though - and they are growing quick!