one of my paired Clown acting weird.

[WWodyz]

Ok i've had this guy for about 6 months now, its been swimming on the middle corners of my tank with his head up. when i tried netting him, he'll swim away. hes been doing this for 2 days now. water conditions all good. what do you guys think?

 

[internexus]

I don't have enough experience to help out 100% but post your water parameters including temperature.

I have seen in previous threads about fish performing this behavior if the temperature is to high.