What discus eat
Discus are omnivores that, in aquariums, do best on a varied diet of quality prepared foods plus frozen meaty foods. They are slow, deliberate eaters and can be shy, which affects both what you feed and how you feed it. Discus are also sensitive to water quality, so feeding and water changes work together.
Best foods for discus
There is no single perfect food. Many keepers rotate several types:
- Quality granules or pellets made for discus, which give a balanced base diet.
- Frozen foods such as bloodworms and brine shrimp, which most discus take readily.
- Freeze-dried or other worms, for example blackworms, as occasional treats.
- Beef heart mixes, a traditional homemade discus food (see below).
- Flakes, which can work for juveniles if they are high quality and sink or are accepted.
Variety matters, since a single food can lead to a boring or incomplete diet. Live foods can carry parasites, so many keepers prefer frozen or commercially prepared options from reputable sources.
How often to feed
One well-known discus seller says adult discus are fed twice daily, while younger fish eat three times a day or more. Juveniles are growing and generally need smaller, more frequent meals than adults. These are common guidelines rather than strict rules, and keepers adjust based on fish size, temperature, tank cleanliness and how much the fish actually eat.
How much and how to feed
- Offer only what the fish can eat in a short period. Discus eat slowly, so one seller notes a meal can take an hour or more. Remove leftovers afterward so they do not foul the water.
- Chop or mince large pieces into bite-sized morsels. Discus do not like chunks that are too big for their mouths.
- Watch that shy fish are actually getting food. Keeping discus in a group usually makes them more confident.
- Do not overfeed in an attempt to fatten fish up. Excess food leads to ammonia and other water problems.
Beef heart mixes
Many discus keepers make a frozen mix based on beef heart combined with seafood, vegetables and vitamin supplements, then freeze it in thin sheets and break off pieces. One discus seller publishes a recipe that includes beef heart, salmon, shrimp, spinach, banana, vitamins, fish oil, garlic and flake as a binder. Recipes vary widely.
The approach is debated. Supporters say fish accept it eagerly and grow well; critics point to the high fat content of beef and prefer commercial discus diets. If you try one, use a trimmed, clean source, store it frozen, feed it in moderation as part of a varied diet, and remove uneaten food promptly.
Epsom salt and discus
Some discus keepers use Epsom salt (magnesium sulfate) as a supportive measure for bloating or constipation, and it appears often in forums. It acts as a mild laxative-type agent in fish, but it does not treat infections or parasites. Because swollen bellies and poor appetite can have causes ranging from diet to serious disease, do not rely on Epsom salt alone. Dosing guidance varies across sources, so follow instructions from an aquatic veterinarian or a reputable source for your situation, and fix water quality at the same time.
How long can discus go without food?
A healthy adult discus can generally go a few days without eating, and many keepers consider a short gap, such as over a weekend, acceptable. Juveniles have smaller reserves and are best fed more regularly. Longer absences are riskier, particularly in warm water, where fish burn energy faster. For longer trips, ask a trusted person to feed small portions rather than using large amounts of food that foul the water. Automatic feeders can help but should be tested beforehand, and they are not a substitute for water changes.
What to do if your discus is not eating
Loss of appetite can have many causes:
- New environment. Newly bought fish are often stressed and may refuse food for a while. Quarantine and a calm setup help.
- Water quality or temperature problems. Test ammonia, nitrite and nitrate, and check the temperature. Discus are commonly kept around 82 to 86°F.
- Boredom with one food. Offer a different food.
- Illness. Signs such as hiding, darkened color, stringy white feces or swollen belly deserve attention. Consider asking an aquatic vet.
Water quality and feeding
Frequent feeding means frequent waste. A discus seller recommends changing at least half of the water twice a week, with water temperature matched when refilling. Keepers with heavily stocked tanks may need to change water more often. Siphon uneaten food and keep a consistent routine.
If you are comparing feeding routines across angelfish and other cichlids, see our article on Koran angelfish tank size, which also touches on feeding frequency for angelfish.