So, I've recently found that some people are growing (and growing well!) plants hydroponically using the waste water from fish to fertilize them. This water is then recirculated back into the fish tank, so its a very low waste system. I've been doing a lot of reading about it, but I don't have room to set up a proper system here (1000L for the fish alone is considered the practical minimum). So, as an interim solution, I'm making a micro system from some Ikea storage tubs. It may all go pear shaped, but logically, I don't think it should take more maintenance than my tropical aquarium. I'm not planning on growing edible fish in this one, but I have my fingers crossed for some edible plants.
I've got a few adapters to print out on the makerbot before I can start it up, but most of the bits are purchased now. Details will follow when time permits.