Betta fish has gap above mouth?

ellamaypeters

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Hi, one of my Betta fish has a cloudy eye and a sort of gap above his top lip. I noticed it this morning whilst I was doing a water change. He seems okay in himself and has eaten. He lives in a divided tank with another Betta and 3 corys the other side but is alone on his side. Any idea what it is?
 
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