so nice tank, nice plate to lay on, good water, occ lock jaw, but not often.

one is 9" the other 10" smaller one is more aggressive the other is a bit finicky with eating.

after 6 months and no breeding activity should I consider I have a pair of same sex fish??

I have another oscar, about 8" my "underwater doggie" (very personable)

should I put Him in with the smaller of this pair (tank swap)
and see what I get ??

Hi and Welcome!

Oscars don't reach sexual maturity until they are about 16 months old, so you will not know anything for sure for a while yet!

You may want to consider only having two Oscars if you want them to breed, fish don't breed automatically, the conditions have got to be in their favor and to their liking. Fish put in an enormous amount of effort when they breed, it's not something that they do lightly. Obviously water conditions play a huge part, they have got to be good. Reasonably high temperatures will also trigger fish into breeding, around 28°C is a good start.

Because they are in captivity and in an unnatural environment, they may never breed, even if you have a male and a female. Some fish are virtually impossible to breed in captivity, you have to remember that keeping fish in a confined environment will radically change the way they behave as they would in the wild.

fish is 10 inches long

still juvenile???

got 82 F right now

meicalnissyen wrote:

not anymore... when they reach that size, they grow slowly and eat not that
frequent. they could take a big bite and not eat the whole day after. the
body will become thicker.

at 10 inches i wouldnt consider them juvenile anymore but i wouldnt say they have reached sexual maturity yet either. as nicki pointed out oscars become sexually mature at around 16 months or so and usually by that time they are about 12 inches in length.