Tang aggression

fishmister · Jun 6, 2025

Hi,
I have a 1005 litre tank (265 gallons roughly I believe) and have 3 tangs (purple, ringtail and a blue) that get along quite well. Recently bought Tomini tang to add into the group, I added him into an acclimation box to slowly get them used to him, I released him a few days ago during lights out and added nori around the whole tank and the purple and ringtail started darting and nipping at his fins, I decided to pop him back into the box to see if re introducing him again after another few days would help and it was okay until he went near their main nori clip, he ended up swimming back into the box as I left it in just in case.
His fins seem to have a few nips out of them and I’m just wanting to know where to go from here, whether I just let them sort it out or figure something else out?

Thank you.

AtlanticGail · Jun 6, 2025

fishmister said:
Hi,
I have a 1005 litre tank (265 gallons roughly I believe) and have 3 tangs (purple, ringtail and a blue) that get along quite well. Recently bought Tomini tang to add into the group, I added him into an acclimation box to slowly get them used to him, I released him a few days ago during lights out and added nori around the whole tank and the purple and ringtail started darting and nipping at his fins, I decided to pop him back into the box to see if re introducing him again after another few days would help and it was okay until he went near their main nori clip, he ended up swimming back into the box as I left it in just in case.
His fins seem to have a few nips out of them and I’m just wanting to know where to go from here, whether I just let them sort it out or figure something else out?

Thank you.

Place a mirror against the tank, see if that helps. I had a kole Tang that was aggressive over my chocolate tang, Once I put the mirror against the glass the kole Tang couldn't stop looking at himself LoL. After 3 days I removed the mirror and all good.