What non living things do fish eat?

Fish primarily consume non-living things such as detritus, which includes decomposed organic material and microscopic organisms found in the substrate. They may also eat algae, plankton, and various forms of aquatic plant matter. Some fish feed on pellets or flakes designed for aquarium use, which contain a mix of nutrients and ingredients formulated to meet their dietary needs. Additionally, certain species may scavenge on dead organisms in their environment.