Rescued Oscar from Petco, tank size question.

i agree. as long as they are getting along with each other, just keep up on water changes and they should be fine for a while. the two bigger ones are going to grow slower at this point, and the little one should catch up.

as far as tank sizes. . . . i think 55g of water is adequate for an oscar, but the size of a 55g tank doesn't provide enough room when they are older, so a 75 is minimum adult tank size because the dimensions allow room to turn around and swim freely. 1-2 adults in a 75, 2 in a 90, 3 in a 125. those limits also allow room for other fish - plecos or dithers.
 
Regardless of tank size you gave those fish a much better home than they had at the store.

Or, some kids 15 gallon tank for that matter.
 
Thanks for the replies, I moved the baby oscar just in case I would hate to come home after 12 hours of work and find him beat up or worse. The two I rescued are still sulking , but they are alive and have room to move!

One thing I noticed is they are constantly opening their mouths, is that normal for a bigger oscar or are they not getting enough oxygen? I have a 100 g air pump running two different bubblers and a power head disrupting the surface along with my filter output pipe.
 
Oscars like to open their mouths alot. At least mine did. It sounds pretty normal to me. If you really want to know get some live food and drop it in. If they go ballistic then they're healthy. Oscars are lazy unless there is food present.
 
The 2 oscars I got from petco hardly move, One sits on the bottom a lot. He can move , but he just doesnt. He slowly swam to the other side when I fished out the food they didnt eat with my net. I have read of oscars sulking a lot when they get moved so Im not too worried about them not eating yet. I tried feeding them a small 2 inch feeder goldfiah that I have had for a month in another tank and they didnt even care about it. There have always been four 2-3 inch goldfish in the 100 gal with them but maybe they arent in the mood to eat. I hope they arent really sick and just are sulking from the move.

The little one doesnt seem any different in his 40 gal tank he is still begging for food and he is constantly staring at me now when Im on the computer now that his tank is only a foot away instead of 12.

I'll test the water in the morning, I hope the canister bacteria is able to keep up with the 2 bigger oscars.
 
I would keep all three in the 100, provided they get along.

But I would be doing 50% water changes weekly also, posiibly more if you think they have HTH.

I would also add another Mag 350.
 
I just tested the water (API liquid test)
Ammonia - 0
Nitrite - 0
Nitrates 0-5 although it looks like 0.
and the temperature is at 76 at the far end of tank (heater in middle)

That doesnt seem right to me but these guys havent eaten anything so they havent pooped so I dont know. I also take out uneated food. But the 6 goldfish are eating and they should be pooping so I should have some nitrates right?

Ill check it again after work tonight. Is it normal for an oscar to stay in one spot when they are stressed from a move? They are still breathing but they just sit there. Ive tried hikari cichlid gold pellets, baby shrimp , freeze dried krill, blood worms, shrimp pellets and tetracichlid sticks and they wont even turn their head. Also the 6 bitesized goldfish in there. Maybe I need to give it more time.
 
Oscars not only need elbow room, they will take it from their tank mates (by killing or eating them). This applies to other oscars in limited quarters. You can uncomfortably house a single in a 20-gallon tank. They really need 30+ gallons. Two adults will co-exist in a 55. They need a 70. Four can live in the 70, but expect lots of arguments.

i found that on a website. is that corrector is it bogun info?
 
I completely agree with rbishop.

Do vast water changes, up the filtration and you will be able to do this.

Of course, larger tank = not a bad thing but come on people, as long as these fish arn't killing each other this is a sustainable set up and better than the current alternatives.

Just keep an eye on the aggression and hope they get along reasonably well.
 
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