Well, everytime my powder tang was chasing my clown tang, i tap the glass in the hope that he understands (i know they are fish not dog but hey worth a try). After keep doing that, now they seems fine now. Some screenshot as they get close to each other
Returning the fish to LFS would be the last resource, It is fun to try out all other options. Part of learning anyway :-)
Thank you for all useful opinions and knowledge.
Cheers
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Uggs