Thanks! They seem to have recovered.. There is still one that sneezes occasionally, but everyone else is sneeze-free. I admit that I didn't quarantine as well as I should have... My mistake. I thought that coming from a "good breeder" they would be OK. The next time I bring in new lines, they will be staying on a separate floor of the house for sure.
When I was using the duramycin, i was changing it out daily... I will have to consider painting some water bottles (so that light won't get through) to use just for treatment purposes in the future.
Thanks again for your help!