Good quality orandas or black moors are worth money but they need to be quality. You will be lucky to get 10% good quality from breeding them as well. I am not sure how orandas will go in the winter down here as I have never kept them outside. They eat plant as well, but if you wanted to grow the vege with only the roots in water that should work. They grow lettuce and tomatoe hydropnically but I don't know about other vegetables. I am also not sure how fish would survive in a proper hydroponic liquid so you would need to work on the requirements of the plants and fish. Could be fun.