Clownfish acting wierd!!

[boeks]

I've had my saltwater tank for about a year and have 2 clownfish in it. Recently the 1 is acting very strange. It often just lies still on the stones doing nothing at all...and it also sometimes swims upright in the corner of the tank for minutes on end.
Is this normal?

 

[crabbychris]

i think it is probably normal, i have heard that clowns go thru certain submissive aggressive stages while changing their ---.