Are Oscars really aggressive?

[FIN01]

I agree it depends in how they are raised. It seems if raised in a larger tank and in a community they turn out quite peaceful.

 

[registered]

i'd say as long as your taking good care of them they're pretty peaceful. As they grow bigger they will assert their dominenec more and more. they're big boisterous fish, but i actually think that they're really friendly fish. Two males together tend to fight more than a male and female or 2 females. Do you know the sex of your fish?

What size tank are they in now?

I don't know how to sex them I'm completely new to Oscar cichlids (have had them for about 24 hours)... I used to have Jack Dempseys though and they bred several times so that must mean I took good care of em !

I have 3x 3 1/2 inch Oscars (2 albino, 1 dark) in a 90 gal tank. Their tank mates are 6x 2 inch plecos, a few snails, ghost shrimp and a few 1 inch catfish that I added to deal with the leftover pellets at the bottom.

I use a wet/dry (sump?) filter with bioballs, activated carbon, and a bunch of other things... I actually bought this filter from a friend that used it on his 180 gal aquarium, and I think it does a great job. Never had any nitrites/ammonia problems in loooong time.

I KNOW this is not a good tank size for Oscar cichlids, and I plan on getting a 300 gal aquarium really soon, probably in the next month or so. I'm really loving these fish and wanna give em the best possible environment