I had the very same symptoms with my angels, the gold more than the others. i bought two new golds from the lfs that had paired up, qt'd them, then introduced them in to my main population. they died in a few days from the symptoms. then my other angels started showing symptoms. i did the salt treatment untill i started seeing ich on my golds. afraid that i introduced other pathogens, i moved all my stock into a clean 20 gal to qt them all and started them on lifeguard all-in-one with 100% w/c every other day. its been 10 days now and no more symptoms. i bleached out my main tank and did a bleach bath at around 5-10% bleach on all my plants and substrate. im sure i killed every living organism in my tank, substrate, filters, and aparently almost all of my plants(pretty sure i used way too much bleach. now my main tank is almost done cycling (the nitrates have peaked and started coming back down). strangely many people i know with recently bough angels from many differnt locations seem to have the same symptoms. all the lfs have this problem with their angels in a 50 mile radius of me. very very strange