was looking for one of the other tank, but came across this

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why do thier fins change color when they do this. i have two that do the exact same thing. first time i saw it i about died. i thought they were gonna die.
 
i have never seen my fish's fins change color, but this isn't a real fight, they absolutely love each other, they rub up against each other, and they stay together all the time, they even take up for each other in skirmishes with the resident convict....
 
what are they? both are oscars, one is a tiger and one is an 'albino'; they are so named even though they are not true albinos....
 
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