Tiny fish are a type of aquatic organism that are typically smaller than other species of fish. The term 'tiny fish' can refer to several different species, including minnows (7 letters), MINNOW (6 letters), guppy (5 letters), SPRAT (5 letters), and MIDGE (5 letters). Minnows are usually found in freshwater habitats, while MINNOW, guppy, SPRAT, and MIDGE are all saltwater species. All of these tiny fish are popular among aquarium hobbyists due to their small size and vibrant colors.