black spot on my clownfish...please help..

fi5033

New Member
This my first posting but I've been reading this mesage boards for many months and Many thanks all of you for greating posting and information.
Now I've got a problem :sleepy: and could use some help. My clownfish got a huge black mark on top of his head and his owner got no clue what kind disease it is and/or how to cure it. I am posting pictures so that you can take a look at the fish. I don't think fish is eating any food anymore.
He is isolated in a 2.5g rubbermaid with a heater, water filter and small live rock. The tank is fairly new about 10 weeks. I had him for about 10 days His is about an inch and pretty small fish. Water reading looks fine 0/0/10. Black spot appeared about 4 days ago.
Could anyone help? Thanks
 
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