For every rule there's the exception that proves said rule. Over the years, usually out of ignorance, I've done my share of putting fish together that were never supposed to share a tank. Some of the times these crazy combinations would work by sheer luck or some divine intervention. Other times they did not. Personally, my oddest odd couple was an 8 in. RB piranha that shared a tank with a fancy goldfish with bloat that wasn't getting better. The intent was to put the goldfish out of its misery, but it hung on for weeks until I finally euthanized it. Meanwhile, the piranha consumed dozens of feeder comets. While most experts might recommend it, I've always had great success keeping adult male jags with Nicaraguan females 1/4 their size. They always seem to get along famously. When I lived in Chicago, the Lincoln Park Zoo kept a large caiman in a display with a huge male Dovii (even though I went several times I never remembered to bring a camera). At any rate, I've always been curious about experiences people have had with tank mate combinations that were never supposed to work yet somehow did. I know I'm being a hypocrite, but photos would obviously be a plus. I hope people respond and I also hope nobody tries any of these experiments at home
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