And what is your point? I've seen wacky combos countless times and it worked for the owners.For cichlid breeding there are such things as tank dividers etc to mediate such risk. As for the silver arrow and tiger barbs etc, I have seen gold fish and rtc together for a long time as well, it does not mean that is a good idea or something people should test and see if it'll work for them.
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As for tank dividers...sometimes a fish can get around a divider and kill their mate or their tankmate...but you took a risk to keep two fish together in same tank even if it has a divider in it.
But hey it's not your fish.