The kole tang is different from other tangs.
They must have the brown slimy algae that you see forming on your glass. That is why he is sucking the brown stuff on your glass.
If you want to keep this tang alive, you can do two things.
1. Keep a large portion of your glass in the corner uncleaned.
2. Buy some of the smooth stones you see in LFS and pile them in an area on the bottom of your tank.
Both these suggestions will provide sufficient food for you kole.
Note the mouth of the kole. It is a sucker an its mouth piece will be damaged if it is forced to eat the brown algae that is also found on jagged live rock.
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