I am not a pet lover.  Although I find dogs and cats very cuddly and cute, I don't even like the idea of cleaning poop up after my toddler.  Even cleaning cat litter boxes is not for me.  So, we have a really nice fish tank because fishes are low maintenance and beautiful to watch.  I notice that the water tends to evaporate and requires replenishment every week. So, I confess that whenever I have left over water from rinsing my fruits and vegetables, I am sometimes too lazy to dump the used water on my garden plants.  Instead, I walk to my nearby fish tank and dump the used water in.  At first, I felt really guilty about it but then I realized that fishes are resilient.  Besides, if you have ever been on one of the boat rides (the one through the greenhouse) in Disney's Epcot Center, you'll find that they have a fish tank below their gardening plants and the water goes from watering the plants down to the fish tank below.  I guess great minds think alike.