My glass catfish have yellow spots behind thier heads

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Reventon

Feeder Fish
MFK Member
Jan 24, 2011
106
0
0
Chicago
I got 7 glass catfish a few days ago and 3 have developed a yellow spot behind thier heads, my water is pretty clean so what could be the problem?
 
Got a pic? It might be their normal coloration and they are finally settling in. Or...
 
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