who is attacking my clown loach

[Bruce]

I have a 65 gallon tank its been running about 3 years now.The same fish have been in the tank for over a year now.i havent added any new fish.But last week i found a Clown loach all riped up he had open sores on his head and body.his fins where all riped apart.yesterday i noticed my big Clown loach with sores on his head hes about 5 inches long.what could be doing this to the loaches i will list what in the tank with them

5 Clown Loaches
4 cory cats
2 Red Rainbowfish
2 Coen River Rainbowfish
2 Rosy Barb
1 Bala Shark
2 Angel fish
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[Lotus]

I'd suspect either the angels or another clown loach. Are there enough caves for all the loaches?

 

[FishGeek]

Id say the Barbs, Bala, Angel, and another Clown Loach are all suspects. Best way to find out is to look at the tank when the light is out at night. Treat the tank with Mela-fix to help the Clowns recover. Or is you have another tank move the injured ones out and into it and treat them, cause once they are injured they are just going to keep getting picked on.