Long term, I’ve had a bad experience with copper and eels, maybe different subspecies have different immunity levels, but my snowflake and zebra died from organ failure from what I presume was the copper
Which eels do you have? I’m considering a banana eel and zebra, I do have a couple smaller fish and they seem pretty safe
If possible, I would keep the Atlantic blue and sohal in a sump or the 32 for a bit after the others go in, my Atlantic blue is a dick to everyone, and I haven’t seen a single sohal that didn’t go Jack the Ripper on all of its tank mages