What to feed discus: a straight answer
Ask ten discus keepers what to feed and you will get ten answers, most of them delivered with total certainty. Here is what actually matters, and why.
What discus eat in the wild
Wild discus pick through leaf litter and soft substrate in slow blackwater. Stomach studies of wild fish turn up a mix of aquatic invertebrates, small crustaceans, insect larvae and a surprising amount of plant and detritus material. They are not open water hunters. They are slow, deliberate, fussy feeders that graze through the day rather than hammering food in one go.
Two things follow from that, and they shape everything below. Discus want food that comes to them and stays put for a moment, and they do better on several small feeds than one large one.
The beefheart question
Beefheart built the hobby's biggest discus, and there is no point pretending otherwise. It is soft, high in protein and fish take it readily.
The problems are practical rather than nutritional. It is mammal muscle, so the fat profile is nothing like what a fish would eat in the wild. It fouls water fast, which is why beefheart tanks are usually bare bottomed with heavy water changes. And it means prep, freezing, portioning and mess, every day, for years.
Most keepers who move away from beefheart are not looking for something better on paper. They are looking for something that gets similar results without turning the fish house into a kitchen.
What to look for in a discus food
Texture
This is the one most people underrate. Hard dry pellets are made for fish that chase and snap. Discus mouth food, taste it, and spit out anything that feels wrong. A soft, moist pellet is taken far more readily, and it can be pressed onto the glass or rolled into a ball, which suits how they feed.
Protein, read properly.
Discus are largely carnivorous and grow best on high protein. The catch is that the number on the pouch is not always comparable. A dry food at 45% protein and a soft, moist food at 38% can be the same food nutritionally, because the soft one carries water. Look for a dry matter figure, or divide the as fed protein by the dry matter to compare like for like.
Ingredients you can name
Blackworm, krill, Calanus, whole fish meal and insect meal are foods a discus would recognise. Cereal fillers are there to bind and bulk. Neither is evil, but the order on the label tells you which one you are mostly buying.
How it was made
High heat extrusion is hard on vitamins and on the pigments that drive colour. Low temperature processing keeps more of both, which is why it matters more in a premium food than the marketing usually explains.
How often, and how much
- Fry and small juveniles: little and often, 5 or 6 times a day. Growth in the first few months sets the final shape of the fish, and you do not get it back later.
- Growing juveniles: 4 to 5 small feeds daily.
- Adults: 2 to 3 small feeds daily.
The portion rule is the same at every age. Offer only what is cleared in 2 to 3 minutes, then siphon off anything left. Uneaten food in a discus tank is the fastest route to water quality problems, and water quality is most of discus keeping.
Pellet size
Too big and they will mouth it and drop it. Too small and adults burn more energy than they take in. As a rough guide, 1mm suits juveniles and smaller fish, and 2.5mm suits growing fish and adults. If you keep a mixed group, a smaller size that everyone can eat beats a larger one that only the big fish manage.
Variety, and how much it matters
A good staple should cover the bases on its own. Variety still helps, mostly because it keeps fussy fish interested and covers any gap in a single formula. A staple soft pellet, plus frozen or live food a couple of times a week, is a sensible pattern. What variety should not mean is five foods fed at random with no idea what the fish are actually getting.
Switching foods without a hunger strike
Discus are creatures of habit, and a fish moved straight onto something new will often sulk for days. Do it gradually.
- Feed the new food first, when they are hungriest, in a small amount.
- Follow with the old food so nobody goes without.
- Shift the ratio over 5 to 7 days until the new food is the whole meal.
- Keep feeding times consistent. Discus learn a routine quickly.
If they refuse for a day or two, that is normal. A healthy adult discus will not starve in a week, and hunger does most of the persuading for you.
Water quality is part of feeding
Every feeding decision shows up in the water. A food that digests cleanly leaves less waste, which means less nitrate, fewer water changes and clearer water. If you are feeding heavily for growth, your maintenance has to keep pace. Feeding and water changes are one system, not two jobs.
Where our discus food fits
We built Origin Discus Soft Pellet around all of the above. It is a soft, fast sinking pellet at 57.4% protein on a dry matter basis, made with California blackworm, Antarctic krill and Arctic Calanus, and processed at low temperature so the pigments and vitamins survive. It can be fed as it comes, rolled into a ball, or pressed onto the glass, and it comes in 1mm and 2.5mm.
If you are curious rather than convinced, there is a 40g sample for £4, which is enough to find out whether your fish take it before you commit to a pouch.
The short version
- Soft beats hard, because discus are fussy feeders.
- Compare protein on a dry matter basis, not as fed.
- Small feeds, often, and siphon off what is left.
- 1mm for juveniles, 2.5mm for growing fish and adults.
- Change foods over a week, not overnight.
Get those right and the rest of discus keeping gets a lot easier.