- Joined
- Nov 28, 2015
- Messages
- 484
- Reaction score
- 263
If it was me in this situation. , I would continue with copper . Keep the air . Add a diatom filter and then a UV filter . .I would be trying to catch any parasites at their free swimming stage if they are able to withstand the copper . One clue you gave me was that the tang was exhibiting this behavior at a later period in time after the emperor showed these signs .

are you having any aggression issues? Kinda looked like there might be a little which can also add stress especially with that powder blue in there