That really is a good idea!How old are your kids? Once they hit toddler range, give them a water bottle and let them water the plants for you. They'll love it so much that they'll ask about doing it again so you won't have to remember on your own.
Oh, I love it! Any time you can be efficient like that, it feels so good. I don't have a fish tank, but it is such a good idea.I gave away all but seven of them because I had just way too many of them. I usually water them every Saturday. I clean my fish tank once a week and just use the waste water to water the plants. The plants get fertilized at the same time!