Yeah, I read a lot of posts. I think I underestimated the bioload. I never got this many fish in at once before but I was watching them and they seemed fine until the 9th day and only the Coral Beauty was breathing hard. I think it might be an oxygen issue but the directions for Paraguard didn't mention anything about needing an airstone like some of the other chemicals. 4 fish died with 4 hours of dosing more Paraguard.
Not all meds mention oxygen depletion, because of this I always assume they will. Which is why many actually use a power head pointing at the water surface to really agitate the water while dosing meds.