amanda asked in PetsFish · 1 decade ago

How big will my ocar fish get?

i have three oscar fish and they are in a 10 gallon tank, if we get a bigger tank how big will they grow?

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  • 1 decade ago
    Favorite Answer

    Oscars require a very, very large tank. For three of them, I would suggest a 75 gallon tank minimum. They are going to outgrow that 10 gallon very quickly, and if they don't get into something bigger, they will die. It is a myth that fish only grow as big as the tank...

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  • 1 decade ago

    If you do your regular (weekly) partial (25-30%) water changes like you are supposed to, 3 oscars will outgrow the 10 gallon tank in about 3 months. The rule of one inch of fish to one gallon of water only applies to small thin fish. One four inch oscar is too big for a 10.

    Also, do not feed them live feeder fish. There is very little nutritional value in feeder fish. They are raised in outdoor ponds and the possibility of them bringing parasites and/or diseases in to your oscars is very real.

    Dry cichlid pellets are very good for oscars and do not mess up the tank like live feeder remains do. I have even fed oscars good quality dry dog food pellets with good results. They must have high protein, though. From 40-50% protein is a must.

    One adult oscar needs a 55 gallon tank, two would need at least a 75 and three adults would have to have a 125 minimum.

    Source(s): 25 years of keeping and spawning many species of tropical fish. 22 tanks up and running at present. I have worked in both the retail and wholesale tropical fish business.
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  • C live
    Lv 5
    1 decade ago

    your oscars will get very big between 13-20 inches long 1 Oscar 55 gallon 2 75gal and for three 100 plus gallons they grow quick about a inch a month for the first 6 or 7 mos so please invest in a bigger tank NOW!

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  • 1 decade ago

    They get very large. They will easily grow into a 60 or 70 gallon tank. They can get over 10 inches.

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  • Kay B
    Lv 4
    1 decade ago

    55-75gal for 1 oscar, 125-180gal for a trio.

    Oscars pack on the inches pretty quick, you'll be needing a bigger tank really soon.

    Expect them to each surpass a foot in length.

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  • Anonymous
    1 decade ago

    oscars get very big if you are planning on keeping all three of them you better start looking for a very big tank 100 gallon or over they grow FAST!!!!!!!!!!!!!!!!!!!

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  • Anonymous
    1 decade ago

    Look out! You got yourself some large fish! Tell Jonah to look out! Here comes the whale!

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  • 1 decade ago

    probably close to 15-20 pounds each.

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