Clownfish trouble
 

So I started a clown tank harem. Out of my 12 clowns, 1 is keep swimming vertical and have labored breathing. Do you guys think he will be ok or should I do something to help him. Oh I've had them for the same amt of time and it's been about a week. The rest are doing great. I added them all at the same time too. I don't really see any aggression towards him from other fish. These guys are also captive bred. If you clown experts can direct me in the right direction I'd appreciate it. Thanks in advance