I think I'm going to write a childrens' story about my guppy George. He has to be the strongest guppy I know of. Let me explain: My son and I have shared a fish tank for over a year. We tried guppies and they died like flies. We tried little catfish and they did fairly well for months before turning belly-up too. We tried goldfish and, fortunately, two are still with us --er,that is out of ten original team members.
The surviving member of our guppy family nearly didn't make it. After a good tank clean (or not so good), and, after we had transferred the remaining survivors to a bowl, we discovered, two days later (we take a while to clean a tank!), that a hapless George was swimming around in a filterless, dirty environment--in about 5cm of water. We rescued George (who could easily have been flushed down the basin), and he joined a few goldfish friends, swimming heartily around with renewed vigour.
George is still with us and has a healthy appetite too, I'm pleased to say. He has to be the strongest guppy in the World!