My! Your fish certainly seems a resilient one - I'd hold onto that one  Honestly, the longest I've had a fish live is about a year. Then, we found that somehow the bowl in which the fish was kept had received a crack, and the water was leaking out. We made an emergency transfer into an old fish tank in which my younger sister had once kept her betas. Leaving the fish safe in it's temporary tank, we hurried to town to get a new fish tank to put him in that was more suited to his needs. By the time we got home, however, he was floating belly up  Apparently the tank had something in it that was toxic to my fish, and so he died.
That was a couple years ago, and I'm looking to start over with a new fish soon - hopefully this one will break my old record  I'm hoping that my fish will be as tough as yours, and live to a ripe old age!
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