clownfish

[canadianbudz604]

Ive had my clownfish for a month, and hes always been very active. But in the past week or so hes been pacing up and down the corner of the tank... His bed where he always sleeps is there. I tested my water and all seems good:

Salinity: 1.025
Ammonia: 0ppm
Nitrite: 0
Nitrate: 0ppm
PH: 8.2

What is his issue? Some things I read on the internet says its normal behaviour. He eats like a fat pig, but doesnt leave the corner too often... He is a tank raised ocellaris...