Richard Ross keeps all his rays in the mid 80's no less, When treating with Binox always use salt the combination of these and high temperature is what really works well. Three to four weeks ago we imported some BD leopoldi from Brazil one of them came in with entire outer edge of disk just falling apart and feet were half gone the skin and flesh was just rotting away in large pieces. The ray went right into a double treatment of Binox, salt and heat and it took a good two weeks of treatment before the problems stopped. The ray is eating and doing great now I was 99% sure I would lose this animal and it bounced back from the treatment. As for everyone lowering the temperature cause of DW thread I would say this is a bad idea, if your going to drop the temperature do it slowly over a week period maybe 1 degree a day. Sudden changes overnight are never good.