Ikan Discus: Discus Fish Care for Malaysian Hobbyists
Ikan discus (Symphysodon) are round, colourful cichlids from the Amazon, often called the "king of the aquarium". They need warm water of 29–31°C, soft and clean water, a tall tank of at least 3 kaki for a small group, frequent water changes, and high-protein food several times a day. Malaysia's climate actually helps: most homes already sit close to discus temperature, so many local keepers only need a heater if the tank is in an air-conditioned room. Water quality, not heat, is where most beginners fail.
Why Discus Do Well in Malaysia
Discus come from warm, soft, acidic Amazon waters. Malaysian conditions match more of that than people expect:
- Warm rooms: homes are about 26–31°C year-round, close to discus range.
- Soft tap water: much of Malaysia's tap water is soft with low KH, which suits discus far better than hard water would.
- Local breeding: Malaysia has a long-established discus breeding scene, so locally bred fish in many colour strains are easy to find, already used to local water.
The catch is chlorine. Malaysian tap water is chlorinated (the national drinking-water standard allows residual chlorine up to 5 mg/L), and discus need large, frequent water changes. That means a lot of tap water going in, and every litre must be treated.
Discus Care Table
| Factor | What discus need |
|---|---|
| Temperature | 29–31°C (28°C minimum for adults; juveniles grow best at 30–31°C) |
| Minimum tank | 3 kaki (90 × 45 × 45 cm, ~155 L) for 5–6 adults; 4 kaki is better |
| Tank height | At least 45 cm; discus are tall fish |
| Water | Soft, pH 6–7, ammonia and nitrite at zero, nitrate low |
| Water changes | Juveniles: 30–50% daily or every other day. Adults: 30–50% 2–3 times a week |
| Temperament | Peaceful but shy; keep in groups of 5 or more |
| Diet | Carnivore: discus pellets, frozen bloodworm, mixes |
| Adult size | 15–20 cm across |
| Beginner? | No; intermediate. Start with sub-adults, not tiny babies |
Do You Need a Heater for Discus in Malaysia?
This is the question that comes up most locally. It depends on the room:
| Room situation | Heater needed? |
|---|---|
| Normal living room, no aircond, water stays 28–31°C | Usually not, but a thermometer is a must |
| Aircond on long hours, or at night in a bedroom | Yes. Water can drop to 24–26°C, which stresses discus |
| Hospital or quarantine tank | Yes, so you can raise temperature steadily during treatment |
| Highland homes (Cameron Highlands, Genting) | Yes |
A heater with a built-in thermostat, sized at roughly 1 watt per litre, is a safe rule. Browse aquarium heaters and pick one rated for your tank size. Also watch the opposite problem: in heatwaves, tanks can climb past 32°C. Add aeration, because warm water holds less oxygen.
Water Changes: The Real Secret
Discus produce a lot of waste, and they are sensitive to nitrate and dissolved organics. Experienced Malaysian keepers say "air, air, air": water quality is everything.
A safe water-change routine
- Siphon uneaten food and waste off the bottom (tukar air from the bottom, not just the top).
- Prepare new water at roughly the same temperature (within about 1–2°C).
- Dose anti klorin that also handles chloramine. Our tap water guide explains why endap air alone is not enough.
- Refill slowly.
Many keepers age water in a large tub with an airstone and a heater or simply at room temperature, then treat it. This makes big changes easier and more consistent.
Test kits
Check ammonia, nitrite, nitrate and pH regularly, especially in the first months. Soft water with near-zero KH can swing in pH, so test before adjusting anything.
Bare-Bottom vs Planted Discus Tanks
| Bare-bottom tank | Planted tank | |
|---|---|---|
| Cleaning | Very easy; waste is visible | Harder; waste hides in plants |
| Growth of juveniles | Best, because you can feed heavily and siphon | Slower |
| Looks | Plain | Beautiful |
| Plant choice | None | Must tolerate 29–31°C |
| Best for | Growing out young discus, breeders | Adult display fish |
If you go planted, choose heat-tolerant plants: Amazon sword, anubias, java fern, many Cryptocoryne and Vallisneria. Carpeting plants and many stem plants struggle at discus temperatures. Driftwood adds a natural Amazon look.
Feeding Ikan Discus
What do discus eat (ikan discus makan apa)? In the wild they eat small invertebrates and plant matter. In aquariums:
- Discus pellets or granules: a good staple.
- Frozen bloodworm (cacing darah) and frozen brine shrimp: popular and easy. See frozen foods.
- Homemade "discus mix": many keepers blend seafood, vegetables and vitamins. Hobbyists traditionally used beef heart, but there are plenty of seafood-based options if you prefer.
- Live food: only from trusted sources, as live worms can carry disease.
Feed juveniles 3–5 small meals a day and adults 2–3. Remove leftovers after 10–15 minutes; rotting food is the number-one cause of water problems in discus tanks.
Popular Discus Strains in Malaysia
You will see listings for strains such as pigeon blood, red melon, blue diamond, snakeskin, leopard, red turquoise, checkerboard and albino varieties. Prices are in RM and depend mainly on size, strain quality, body shape (round is valued) and whether fish are sold as a pair. Bigger, rounder fish with clean colour cost more.
Tank Mates
Discus are best kept with their own kind. If you want company, choose calm species that tolerate the heat:
- Cardinal tetras and rummy nose tetras
- Corydoras that handle warm water (such as sterbai)
- Bristlenose plecos
- Some keepers add German blue rams, which also like warm, soft water
Avoid fin-nippers, fast greedy fish, and angelfish unless you know the risks (they can share diseases and compete for food).
Common Discus Problems
- Hiding, dark colour, not eating: stress from poor water, a new tank, or bullying. Check water first.
- White stringy poop and weight loss: often linked to internal parasites. Ask an experienced keeper or your shop about suitable medication.
- Pitting on the head: associated with poor water and diet. Improve water changes and feeding variety.
- White spot: less common at discus temperatures, but possible after transport. See our white spot treatment guide.
For general troubleshooting, read why aquarium fish die.
Buying Discus on FishyHub
Browse discus for sale from Malaysian sellers. Before you buy:
- Check the size (usually in cm or inches) and whether the photo is the actual fish.
- Look for round bodies, bright eyes in proportion to the body, and fish that are eating.
- Ask the seller what water and temperature the fish are kept in, so you can match it.
- Check delivery or self-collect options and live-arrival terms on the listing.
Frequently Asked Questions
Ikan discus air apa?
Ikan discus suka air lembut, sedikit berasid (pH 6–7) dan panas, sekitar 29–31°C. Air paip mesti dirawat dengan anti klorin dahulu, dan air perlu ditukar dengan kerap.
Ikan discus makan apa?
Pelet khas discus, cacing darah beku, artemia beku dan campuran makanan buatan sendiri. Beri anak discus makan 3–5 kali sehari dalam kuantiti kecil, dan buang sisa makanan selepas 10–15 minit.
How many discus should I keep together?
A group of at least 5 or 6. Pairs or trios often end up with one fish bullying the others.
Can discus live in a 2 kaki tank?
Only one or two young fish, short term. For adults, plan at least 3 kaki and ideally 4 kaki with good height.
Do I need RO water for discus in Malaysia?
Not usually for keeping them. Many local keepers use treated tap water. Breeders sometimes use RO for spawning, but stable, clean water matters more than perfect numbers.
Discus reward patience with stunning colour and calm behaviour. Browse discus, heaters and frozen foods from Malaysian sellers on FishyHub, and if you are new to cichlids, plan your setup with our aquarium size guide.