adolescent gourami behavoir?

Question

I have a blue/three spot gourami (almost four inches) which has recentley become aggressive. He has begun to spar with his reflection and chase his tankmates arround, he has made it clear to all parties involved that he has established "his"territory in the tank. ( the other fish are perfectley fine) I am wondering if anybody else has experienced this kind of aggression, possibly as a result of adolescent gourami.
However, the issue could lie within my filter. Within the past week my filter has been making very strange noises. Two nights ago I awoke to the gourami with his aggression face on in the direction of the noisy filter (internal). This afternoon I did a "deep clean" of the filter and totally got rid of any leaves or algae which could be causing this terrible sound. Hopefully his recent agression will end with the annoying, disfunctional sounds. questions
1) have you experienced any adolescent gourami aggression?
2) could this behavoir be the result of the filter noises?

Answer 1

This is typical 3 spot behavior and is a result of the fish reaching maturity. The sparing with the filter is probably because of the sound it makes, but the aggression towards the other fish is completely normal behavior. I wouldn't worry unless you are seeing damage to the other fish or their area of the tank too restricted for them to swim around.

MM

Answer 2

This is normal 3-spot gourami behavior. The get aggressive toward other gourami as they get older.

Answer 3

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