Clown Loach Nipping

GrumpyOldMan

I have two clown loaches in my 75 gallon tank. Both were purchased at the same time and have lived harmoniously for 2 years. Both are about 5-6 inches long. I noticed that part of one's dorsal fin was not looking quite right. Yesterday I found out why. The other clown is relentlessly nipping at his dorsal fin. I don't know what has brought on this aggression. Water and filtration are fine. I realize a bigger tank might be helpful, and a group of 5 is preferable, but right now that is not an option. Plenty of hiding places. No recent additions or changes. Tomorrow I am going to move the aggressor to my 30 gallon Quarantine tank in order to give him a time out and hopefully give the injured one time to heal.

I am open to other suggestions. ,
 

A201

I think you answered your own question. Botia type loaches do better in groups. The time out tank or a hardscape re-do are just temporary fixes.
 
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