Awww... those were nice. I'm sorry you couldn't save them. Considering I'm adding 2tsp, 2x/day to my 100g system, I do not believe the small amount you added had anything to do with the problems you had. Just a coincidence, IMO. If you had added more (starting at 5ppm & upping it as the chart says), you might have been able to save those palys.
I am adding 1/4tsp to my 15g tank & started there.