I have had jaguars and gars in the same tank for over a year and they do fine together. Even after the gar out grows the Oscar if they have been together for a Long time the gar will not look at it as a food item the Oscar might get rough with the gar at first but gars are tough fish they can handle a little picking on just keep an eye on the to make sure it don't get out of control. These people that are saying no probably have never tried it
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