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Discussion Starter · #1 ·
I had a Yellow Tail Acei that was not aggressive. He was the largest fish in the tank and did hog all the food but didn't pick on the other fish. Yesterday I did a 80% water change and he became aggressive to all the other fish. He was my least favorite so I gave him away. Is this normal? It makes me not want to do a water change anymore.
 

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It likely had nothing to do with the water change. As fish mature, the pecking order can change from time to time with no other trigger to the new behavior.
 

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Discussion Starter · #3 ·
thanks, DJ, your always veryhelpful
 

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Water changes can "energize" fish and get them "feeling their oats", that is pretty normal with all types of fish. Water changes are a good thing, healthy for the fish. 80% is a big change thou. Don't normally change that much.

He would be a "bully" at some point anyway. You usually end up with a dominant male, and sometimes they chase other fish, this is all very normal.
 
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