I think the pic may have been playing tricks because those fish were spotless in real life. Definitely no ich or velvet. I also did a freshwater soak after they had died to see if any parasites would come out and there was nothing. I’m pretty convinced at this point that the issue is the fact that I’m using bottled distilled water from a grocery store for my ATO. I’ve turned off my ATO and will get ro/di water from my lfs today to refill the reservoir with the right waterPic fuzzy but it appears fish have ich or velvet and velvet especially will quickly take them down. With velvet, fish would be sluggish, no appetite and breathing heavy as signs. Moving forward, quarantine next fish and leave this tank they died in fishless (fallow) for at least 6 weeks to assure any protozoans or Flagellates dies off without a fish to host on)