My fish is a jerk!

[bigbanker]

My Kenyi has been on a roll lately... He challenges my large Acei and now my yellow lab. He won't take on the auratus... yet.

What can I do to help tone down the aggression?

 

[mfdrookie516]

what size tank?

 

[bigbanker]

he is in a 55g. Though he is the only one of his species.