Clownfish staying near overflow?

Mine have a corner that they think hosts them. Clowns do weird things, Im assuming they are new to your tank? If so they may claim the overflow as their home or once they settle they may find a different spot, or coral, or anemone, or rock, or shell.... to call home.
 
Yes, multiple pairs of mine have done so when young.
You need to look at a disease process when they stop eating, develop spots or a mucous layer, and breathing heavy.
 

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