Clownfish acting odd

ph-8.4
ammonia-0
nitrites-0
nitrates-15-20
ph-1.026
temp-82

I did a 15% water change about 2 weeks ago. I just lowered the temp, trying to get it to 78-79. They are fed mysis shrimp and brine shrimp once a day. I have no idea why my SG is 1.026, it was 1.024 a week ago but I do use a hydrometer.

Today he/she was being anti-social (unusual) and did not eat. It seems as if he/she is breathing a bit heavy and it appears that its lips are a bit pale as if they are turning a little white. I read a previous post about this but they are not that white.

His/her usual behavior is very active and social with my other clown and is always to the top of the tank when its lunch time. I dont see any signs of white spots on him but he did have a white string hanging from the underside. Its now gone though. He/she has been pretty much in the same spot all day today facing downwards. Every once in a while it will swim with the other and then go back to the previous spot. Any thoughts or suggestions?

Brian

 

Bump!

 

Pic would really help.
How old is the tank and how long have you had the clown?