2 Oscars and one Green Terror

[OscarGT]

Starting a cycle new 55 gallon tank.
Adding the 2 Oscars first and the green terror 3 days after. They are small yet but green terror is twice the size of the two oscars. Should i be concerned?

 

[Toney]

I would think so...

 

[OscarGT]

Anyone else have an opinion. They green terror is about 3 inches and the oscars are about 1 and a half.

 

[Demeter32]

A 55 is barely large enough for 1 oscar let alone 2 and a green terror. Good thing they're still small because you will need to upgrade to about at least a 120gal as they grow. I'm not too sure how well a GT and oscars will get along though, i know both get large and aggressive. I would say the GT could very well attack and kill the tiny oscars as it will probably stay larger than them for a while yet. Be ready to remove/rehome the fish if they can't get along.

 

[Byron]

I agree. Oscars will usually attain around 12 icnhes/30 cm in aquaria, but can get to 18 inches/45 cm. One oscar needs a 75g (4-foot) tank.