In photo I can see no signs of Ich on neon.
Ive never heard of "stress Ich". Can you link me to where you have read of it being "of a different nature" than the Ich we routinely see.
I posted pics of it above, it's very hard to see but if you look closely on pics 2-4 of the neon it's there as I can see it on my screen, it's tiny white dots on her dorsal fins and tail fin.
People touch on it at times, Aquarium Coop Cory just hinted about it on one of his video's and I've seen others mention it but no one really put their finger on it. Heard the Neon white spot could be NTD/cyst. ON YouTube search, search for Aquarium Coop Ich and Cory has a video on how he treats Ich, he mentions "stress" ich and what "he" thinks or doesn't think it is.
I started the 2nd "delayed" round of Kanamycin/Furan 2 on Monday, today his tail fin looked much more ragged and lost quite a bit of it. The saddleback seemed to have gotten smaller, there's still "white" where the dorsal fin meets his body. BUT I don't think my swordtail tail is going to make, he is very very restless this eve darting around and hitting the glass, sponge filer from watching him for a minute. I can't bear to watch him. Hope he's still alive tomorrow morning. My Neon Tetra looks the same so... .
Monday added the Kanamycin/Furan 2, Tuesday added Furan2, today(Wednesday) did a 25% water change as water parameter looked good and added Kanamycin/Jungle Fungus Clear as a replacement for Furan 2. When I saw the tail rot had gotten worse today, I figured I would change it up a bit with Jungle Fungus Clear instead of Furan 2, as it has the same med as Furan 2 + Potassium Dichromate.
Bump: I also noticed today that his dorsal fin "rays", the spines(?) of the dorsal fin has darks spots/lenghts so to say but it's not clamped down. I've also gotten Focus and have mixed some General Cure with tiny pellets they eat to see if it clears up his "white" poo. I'm really med'n these 2 up.
As I've stated prior, I did a round of Tetra LifeGuard, a round of Erythromycin/General Cure combo and am on the 2nd round of Kanamycin/Furan2(Jungle Fungus Clear) combo and just tried one feeding of Focus/General Cure soaked mini Hikari pellets.