Of course it is true. I keep silver aros and rays together. I have one that is 2.5 feet long in a 600gal with 3 big Rays and a 18 inch Kelberi and have never had an issue ever. An 18 inch silver in a 300 gal with 4 10 inch rays and others and never an issue. If they are stressed for space they get ornery.
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