Oscar Aggression

[Rohanz21]

Hi All,
I have 6 oscars of around 5-6 inch in a 4*1.5*1.5 tank. Two of them are Tiger and rest all are cover. Recently there's an aggression issue which is affecting 3 of the best coppers from the lot. Someday their fins, scales or bodies are bruised and injured. Need advice to solve the situation.
Thanks!!

 

[pescado209]

based on your dimensions (48x18x18 inchs) that's a "67g "tank. I don't know alot about Oscars but I do know that you are way over stocked . I have 2 5" inch Oscars in a 75g . that's just a temporary tank and that tank already looks small. Oscars need large tanks to swim and especially since they grow up to 12 inchs . someone with more experience will chime in soon.

 

[skjl47]

a 4*1.5*1.5 tank.

Hello; is that 4 foot x 1.5 foot x 1.5 foot? If so this one is easy, get a much much bigger tank.

 

[Jexnell]

Like others have said you have to many fish for your tank size and chosen fish.

I have a single Oscar growing out in a 55g, it's about the size-ish you mention yours is, and it already makes the tank look small. I couldn't imagine what it would be like with 5 more in there.


Simple fix is to rehome some of them, or get a bigger tank. For 6 adult Oscars I would say at least 180 6x2x2 foot tank, probably more like a 240 8x2x2.

Oscar's are messy dirty fish, how is your water parameters, how often do you do water changes, I change mine every 3 days 50%. With that many Oscars in that small of a tank you must be doing it daily?

 

[Rohanz21]

Is the aggression issue due to th tank size?

 

[Jexnell]

Yes totally, barely enough room in that tank for a single juvenile Oscar to stake claim to a piece of land, let alone six.

 

[skjl47]

Is the aggression issue due to th tank size?

Hello; Yes picture six aggressive karate fighters in a closet.

 

[Jexnell]

Hello; Yes picture six aggressive karate fighters in a closet.

OMG I can't stop laughing.

 

[Covetous]

Hello; Yes picture six aggressive karate fighters in a closet.

I like to think of oscars more as Luchadores

 

[Rohanz21]

Thanks for the suggestions everyone. Will shift 4 and keep only 2 as if now. Will update you about the scenario.