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Could be marine velvet
I have never had a Gem tang, but they are in the Zebrasoma family. Which tends to be fairly aggressive (as far as tangs go). I would think it would be bullying a hippo that was half it's size and not the other way around. Makes me wonder if there wasn't something going on with it before you noticed the bullying.
I am no tang expert, but in my experience, Tang's only "bully" or act stressed for that matter when they are not getting enough to eat and or water quality.
What have you been feeding them, and how often?
He’s going on 5 weeks in the qt wouldn’t of that of happened right away??
Lrs 2 times a day and a little seaweed once a day. I doubt it would be water quality ammonia is fine and I did a 50% water change on Sunday
By water quality I meant more then just ammonia, and nitrate. I mean anything in the water it doesn't like.
Sounds like you're feeding enough. I really dont know
Anybody else have any suggestions!??I’m debating on doing a water change when I get home to bring down the prazi levels but I just did one Sunday and don’t want to stress him out anymore
If the fish was not in fully therapeutic copper for a full 4 weeks let's call it 30 days, then it's likely something returned.
14 days won't cut it unless you transfer to a completely sterile quarantine, sharing nothing with the first, and you do not cross contaminate with the first or a "dirty" system.
Is he scratching? Swimming into current. Breathing heavy? It’s hard to tell on the pic does his skin and color look completely normal without lesions? Is it pooping? i agree a blue tang half the size is not the biggest issue here, unless the aggression is severe.
you can always restart copper at half dose and slowly go back up to therapeutic levels.
I am so sorry about your tang....! I just happened across this and I am keeping my fingers crossed for the little guy/gal. You are in good hands here!
You are doing a great job! Hoping for the best! Keep us posted!Thank you! I know his chances are low but hoping for the best hopefully me putting copper back in the system gets him under control. Fingers crossed