Algae and Sinking Wafers

Wafers are slow-dissolving sinking discs made for bottom feeders and grazers, in herbivore (algae) and protein-rich versions.

What it is

Wafers are flat, compact discs of dry fish food designed to sink and dissolve slowly. Among prepared dry foods, which include flakes, pellets, tablets, granules, and wafers, the wafer form is shaped for extended grazing: it holds together long enough for slow-feeding fish to nibble at it over time before it breaks down.

How it is made

Wafers are formed from a dough of dry feed ingredients that is shaped and dried into firm discs. Like other dry feeds, they are weighted and bound so they sink rather than float, and they are formulated to break down gradually instead of dissolving at once. Depending on the recipe they can be tuned toward plant or animal nutrition, drawing on ingredient sources such as fish meal, shrimp meal, spirulina, and soybean meal.

Algae versus protein wafers

Wafers are produced in two broad types. Herbivore or algae wafers are built around plant matter and algae, often including spirulina, which is a dried cyanobacterial biomass that contains roughly 57 percent protein by weight and is widely used in aquaculture feeds. Protein or carnivore wafers contain higher proportions of animal-based ingredients such as fish and shrimp meal for species needing more protein. Many wafers blend plant and animal sources.

Best for

Because they sink and persist, wafers suit bottom-dwelling and grazing animals such as plecos and other catfish, loaches, corydoras, and invertebrates including shrimp and snails. Algae wafers target herbivorous grazers, while protein wafers serve bottom feeders that need more animal nutrition. Smaller wafer sizes are made for shrimp and juvenile fish.

How to feed

Drop one or more wafers into the area where bottom feeders gather, ideally after lights-out for nocturnal species such as many catfish. Offer only the amount the animals can consume, since uneaten wafers break apart and add to organic waste. Overfeeding is the most common feeding error and degrades water quality, so remove leftover wafer fragments. For most pet fish a single daily feeding is adequate, on at least five days per week.

Storage

Wafers are a dry feed and follow the same storage rules as flakes and pellets. Moisture and air shorten shelf life by oxidising vitamins and turning fats rancid, so opened wafers are commonly used within about six months. Keep the container sealed and dry, away from heat, humidity, and direct light.