So uh... I don't want you to think I'm one of those "asks for help and then doesn't take action when given advice" people, but here's where we're at now, I just got the copper power/hanna checker in; I didn't want to move the fish without having the qt up and ready for them. That said however, while the copper/checker will definitely come in handy if I don't end up using it, I'm going to try the hybrid TTM with 150 ppm 3% H2O2 dips before I infect a tank and equipment with/subject the fish to copper. I have 3% H2O2 on hand for disinfecting reptile enclosures.
In terms of the fish themselves... they no longer have the big visible dots... now it's a lot of little fine nubs and some blotches of slime, almost looks like velvet or brook but interestingly these are not visible under white light. The blotches don't show up too well on camera but you can see the dots. Still ich?
(The thing on the face in that last picture is on the glass outside the tank)
They are however, acting perfectly fine, which to me rules out a "secondary" velvet or brook infection, in fact they're even more active than when I first made this post... swimming/breathing is normal, fins fully open, good appetites, though I will say their fins look like they're taking a bit of damage, skin looks scarred (you can kinda see in white light pic), and they're definitely losing a bit of muscle mass. I can understand them looking drained given the ich is literally eating them. Been just trying to keep them fed with good food (frozen spirulina mysis, spirulina brine, PE mysis) so they're in good spirits at the very least. Hybrid TTM and following fallow should give me better peace of mind hopefully. Going to be a rough few months for the little guys.
The skunk clown has a few blemishes on the fins but nothing as bad as the ocellaris. The bicolor blenny and banggai are completely unscathed.