question about fh's kok

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Nibbler80

Feeder Fish
MFK Member
Feb 23, 2008
62
0
0
ogden, ut
i have some 1.5-2" juvies and as they have started to get larger i noticed that the ones that seem to be developing a kok have "cracked" looking heads. almost like the scales are scratched or scuffed. my largest has it most noticably but he also has the larges bump. what is this?
 
Need a pic. He's not jumping up and hitting the lid with it or anything is he? A FH's kok can/will have scribbled color lines that run through it.
 
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