Thanks for the replyObservational quarantine still has risk. The fish's immune system may be able to keep it looking healthy while it is actually hosting a disease or parasite. How will you know if they are not carrying anything in their gills? If.medication is not an option for you I recommend the "tank transfer method," or a saltwater molly.
Hmm, that is true. Surely if I go weeks and weeks, any ich would eventually show up, right?