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Yes they are eating well, no sign of them gasping or anythingMouths open can be a sign of uronema but that's not commonly seen in tangs, nor is it an assumption I'd make. It could be a mouth injury from darting in to rocks or quarreling. If they're eating and no other symptoms, I wouldn't concern myself too much.
How many times are you feeding your fish ?It probably is them not eating enough. I have a yellow tang and it had the same problem. The reason it happens is that they are constantly eating algae on the rocks and so there mouths are sore. Just get them eating a little more so that they can spend less time having to eat the algae and you will have them back into shape in no time.
No I have had them over 3 months now"Mouths open" and breathing rapidly?
Are these new fish to you?
Yes I agree with you , I feed the algae pellets on a daily basis, and nori sheetsTank looks pretty bare of algae for them to eat. Are you feeding nori or other algae sheets? My kole would have this happen when my tank was still new. I agree with @Nigel35. They keep picking at rocks or glass to feed and aren't getting enough to eat. Causing their mouths to be sore. Try nori sheets on a clip. LRS Herbivore blend is good too.
Mine does that too and eats well she’s a piggy lol and very active and I’m very suprised not skittish with me at allMouths open can be a sign of uronema but that's not commonly seen in tangs, nor is it an assumption I'd make. It could be a mouth injury from darting in to rocks or quarreling. If they're eating and no other symptoms, I wouldn't concern myself too much.