I've started grouping my sick fish in one tank and then start dosing. A lot of times, one dose will clean all the sick fish with that illness.

I meant to quote someone and respond, but I couldn't find it again.

I also wanted to add a request for sticky notes on my tanks. I can't always remember what I am trying to do in any particular tank. My notes get lost and I just end up doing something different and losing my original intention, like breeding a particular fish or seeing the results of a particular egg purchase.