I think my clown is stressed

[stephcat15]

Hi everyone I have a question in regards to my occ. clown. I've had my 120 litre tank up and running for 5 months. It has fully cycled and not had any fish in it til last weekend when I bought two little clowns. They seemed to be doing ok at first but now one of them keeps opening and closing his mouth all the time. He seems to have backed away from the other clown too. I'm a bit worried that there may be something wrong with him. Any help would be very much appreciated. Thanks in advance.

 

[salty160]

What are your parameters, is there any aggression b/t the two clowns. a pic or vid would be helpfull.

 

[stephcat15]

pH - 8
ammonia - 0
Nitrite - 0
nitrate - 0
temp - 27 Celsius

I haven't seen any bullying between them, and have just noticed what seems to be a small lump on it's mouth. I can't seem to upload a video, I hope you can see enough with the pics. He hasn't eaten today or last night either