yes, Jaysee is correct. Oscars are some big fish and grow quickly. It's more about room than volume of water. With good filtration and maintenance your 65 gal of water doesn't have a problem supporting the growth and care of maybe 2 oscars and possibly 7 - 10 cichlids but your tank size does. It's just not large enough and you would eventually have to upgrade in size or get rid of some fish.
Thanks everyone ! I have a 125 gallon that I plan to start .... So how long do u think it will take a couple of Oscars to outgrow the 65 gallon ? Then I plan to transfer them to the 125 and then keep some other cichlids in the 65
You can expect them to grow an inch per month for the first several months so I would say you have about 6 months, which is why we say wait till you have the big tank
Oscars can hit 10" in the first year but that is pretty rare. I have 2 that are about 18 months old and they are 8-9" so not huge but would fill up anything under 100g pretty fast.
As far as tank mates it depends on the fish mine do well with other SA/CA cichlids but I have heard others don't do well with smaller fish. From what I have read Oscars can be pretty mean but mine are big babies, if you don't count when the smaller one bit me last week because they have eggs.
in my opinion a single Oscar should be housed in a 75g, once your Oscar grows to 11-12" you'll start kinda feeling bad for him so I'm glad your upgrading to a bigger tank.
In a 125g I wouldn't do more then 2 Oscars
if you want you could always try adding a school of some Congo tetras or bosemani rainbows ect.. which grow up to 3", to your new 125g. I've heard of some success stories.
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