Clown Loach picking on silver dollar?

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clugsy

Exodon
MFK Member
Sep 28, 2011
30
0
21
Calgary, Alberta
I have a 200 gallon tank set up, with some 6-7" rays, 4 clown loaches and a couple of silver dollars. I just noticed one of the silver dollars looks like a fish has been chewing on him. I can see the loaches picking on the wound. Anyone else have this happen? Is this normal for loaches to attack a silver dollar? the loaches are 3-4" long. Silver dollars are around 4" long.
 
I have had clown loaches attack each other on their dorsal. It was a evil loach presumably establishing hierarchy.
 
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