I'm far from an expert but I've seen some interesting things where people replace the fish tank with worm bins and/or black soldier fly bins and they just use c

I'm far from an expert but I've seen some interesting things where people replace the fish tank with worm bins and/or black soldier fly bins and they just use compostable material and kitchen scraps as the feed. The flies especially will eat pretty much anything but the worms are easier to keep alive. The plants are fed hydroponically by pumping water through the feed bins, so it soaks up the nutrients in the compost. It's an interesting concept.