Bump your water changes with aged water to 50% every day, at least until they are better. I would also add 3-4 TBS salt per 10 gallons, replace the salt after each water change for 7 days. Hold off on the actiflavin.
If you can fill out this form and paste it back on this thread we might be able to uncover more info.. The fact that they are from a LFS can be a concern
http://forum.simplydiscus.com/showth...lease-complete
Brian