no fish

I currently have no fish in my lagoon tank and possibly might prefer no fish. I know ammonia is a major thing which feeds corals which fish produce. I top off my tank with tap water only treating chlorine and not the ammonia in the water. Has anyone kept an all reef tank with no fish...

At some point in the future, I would like to set up an aquarium with only invertebrates like snails, crabs, shrimp, brittle stars, and so on. (no fish or corals!) These are in my opinion, some of the most fascinating members of the aquarium hobby and reef ecosystems in general! So naturally I...