IMO you’re on the right path. Keeping meds therapeutic almost immediately so as to limit the time in copper would be all else you can do. Feed varied foods soaked particularly in zoecon as well, as it seems to help the most with HLLE.
Yea, it’s a slight... almost tin looking, erosion around the gill plate and lateral line. They both ate this morning and it already looks better so I went ahead with increasing copper to 1.75-1.8. Will test in a few minutes.
No zeocon here but I do have selcon. They leave a mess of the nori scattered all over the tank, though. This is somewhat annoying because nori, apparently, doesn’t taste as good once it’s off the clip.... grrrr!