How Much Does It Cost to Keep Discus Fish? The Real Budget for Tank, Fish & Monthly Care

"What does it actually cost to keep discus?" is one of the most common questions we get from soon-to-be keepers — and a fair one. Discus are often called the "king of the freshwater aquarium," and their reputation as demanding, expensive fish makes many people hesitate before buying.

The good news? Keeping discus is not as expensive as you might think — if you make smart choices from day one. The less-good news? Budget mistakes on your first setup can cost you double what a correct investment would have, because you end up replacing gear and treating sick fish.

This guide walks you through a realistic discus budget, built from real specialist-store pricing and the collective experience of the discus.ro community. You'll find three scenarios (Lean, Balanced, Premium) plus a breakdown of recurring monthly costs.

💡 Bonus: at the end you'll find our interactive monthly cost calculator, which estimates a personalized budget based on your tank size.

📊 At a glance: the three budget tiers

Why no fixed global prices? Discus, equipment and water costs vary widely by country, brand and strain. The Romania-specific figures below are kept as a reference and clearly marked as Romania estimates (2026) — treat them as a starting point, not a global price list. Always get current local quotes before you buy.

Each tier is detailed below, with the cost drivers that actually move your budget.

1. The aquarium — the foundation (40–50% of your budget)

The first and most important decision is tank size. For discus, the rule is clear: a minimum of ~40 liters (≈10 US gallons) per adult fish, so at least 200 L (≈53 US gallons) for a decent group of five. Full details in our guide on the ideal aquarium size for discus. Work out your exact volume with the aquarium volume calculator.

Tank cost drivers

• New 200 L (≈53 gal) entry-level or DIY tank — the cheapest realistic starting point.
• 240–300 L (≈63–79 gal) mid-brand, ready-fitted tank — a comfortable middle ground.
• 400 L+ (≈106 gal+) premium tank with cabinet — the top of most home setups.
• Second-hand 200–300 L (≈53–79 gal) — often the best value, but inspect the glass and silicone carefully.

🇷🇴 Romania estimate (2026): new 200 L ≈ 600–1,000 RON · 240–300 L ≈ 1,200–2,000 RON · 400 L+ ≈ 2,500–5,000 RON · second-hand 200–300 L ≈ 300–800 RON. Local reference only — confirm current prices in your country.

💡 A key money-saving point

A bigger tank is, paradoxically, cheaper in the long run: water parameters are more stable, fish are healthier, and water changes are proportionally less frequent. Don't save on volume — save on cosmetic finishes.

2. Essential equipment — where you don't cut corners

Discus demand rock-solid stability of water parameters, and quality equipment is what delivers it. See the full list in essential discus equipment.

Filtration

Filtration is the single most important piece of gear. Compare options in sump vs external filter for discus.

• Internal sponge filter (for quarantine and juveniles) — inexpensive and gentle.
• External canister filter for 200–400 L (≈53–106 gal) — recommended for most setups. More in the best filtration for discus.
• DIY or ready-made sump — for experienced hobbyists.

Heating

Discus want a constant 28–30 °C (≈82–86 °F). Details in the aquarium heater guide.

• 200 W heater (for 200–250 L / ≈53–66 gal).
• 300 W backup heater (strongly recommended) — don't put all your eggs in one basket; if a single heater fails, fish can die within hours.
• Digital thermometer with alarm — a small spend that saves lives.

Lighting

This depends heavily on the tank type. See the full lighting guide.

• Simple LED, aesthetics only (bare-bottom) — the cheapest option.
• Good LED for low-tech plants (Anubias, Java Fern) — a moderate step up.
• Premium LED for a high-tech planted tank — the most expensive lighting choice.

Substrate and décor

See the detail in discus aquarium substrate and décor and hardscape.

• Bare-bottom (recommended for beginners) — free.
• Fine natural sand (≈10–20 kg for a 200 L / 53 gal tank).
• Hardscape wood (driftwood).
• Catappa (Indian almond) leaves — a year's supply is cheap.

🇷🇴 Romania estimate (2026): internal sponge filter ≈ 50–200 RON · external canister ≈ 400–1,200 RON · sump ≈ 800–2,500 RON · 200 W heater ≈ 80–200 RON · 300 W backup ≈ 100–250 RON · digital thermometer ≈ 30–80 RON · LED lighting ≈ 200–2,500 RON · sand ≈ 100–250 RON · hardscape wood ≈ 80–300 RON · catappa leaves ≈ 30–60 RON/year. Local reference only.

3. The fish — the emotional investment

Discus prices vary enormously by strain, size and breeder. To work out how many fish your tank can hold, use the stocking calculator.

How price scales with size and strain

The relative scale (more expensive as fish get larger and rarer) holds everywhere; absolute prices depend on your local breeders and importers.

🇷🇴 Romania estimate (2026), per fish: common strains ≈ 80–700 RON · mid strains ≈ 120–900 RON · premium strains ≈ 200–2,000 RON · wild/Heckel/Altum ≈ 300–5,000+ RON, depending on size. Local reference only.

Explore the available strains in our encyclopedia and find verified breeders in the Breeders section.

💡 Where to buy — three options

1. Verified local breeders — our top recommendation. Fish already acclimated to local water, fair pricing, and after-sale support. See our verified breeders.
2. Specialist online stores — convenient, but mind the stress of shipping.
3. Direct import (Stendker, Asia) — better per-fish price at volume, but higher risk and acclimation cost.

⚠️ Warning: never buy discus from general pet shops (non-specialist stores). The risk of disease and stress is high. Read how to choose a healthy discus.

4. Food — monthly budget and initial stock

Discus are omnivores with high protein needs. For a balanced diet, read the feeding guide for beginners. Estimate monthly consumption quickly with the discus food calculator.

Initial stock (for 2–3 months)

• Premium discus pellets (250–500 g).
• Frozen food (brine shrimp, bloodworm, krill) — about a month's supply.
• Beef-heart mix (ready-made or DIY) — optional.
• Spirulina / garlic supplements.

Monthly food cost (≈6 fish)

• Lean (pellets + occasional frozen) — lowest.
• Balanced (pellets + regular frozen + beef heart) — moderate.
• Premium (maximum variety, supplements) — highest.

🇷🇴 Romania estimate (2026): initial stock ≈ 230–500 RON; monthly food ≈ 50–80 RON (lean) / 100–180 RON (balanced) / 200–350 RON (premium). Local reference only.

5. Water, testing and consumables (monthly cost)

This is where a casual fishkeeper and a serious one part ways. Use the water change calculator to plan your routine correctly.

Water testing

See how to test discus water.

• Liquid (drop) test kit (NH₃, NO₂, NO₃, pH, GH, KH) — lasts 1–2 years.
• Digital TDS meter.
• Digital pH meter (optional, more precise).

Water for changes

Details in water changes for beginners. If you blend RO water with tap water, try our RO + tap water mixer.

• Tap water + dechlorinator — lowest cost, scales with tank size.
• RO (reverse osmosis) water — recommended for wild fish / low pH; either bought per batch or via a one-time RO unit that pays off over time.

Preventive treatments

• Dechlorinator (e.g. Seachem Prime, JBL) — a single bottle lasts months.
• Stress coat / slime-coat products — a bottle lasts months.
• Specific treatments (metronidazole, levamisole — only when needed). Dose correctly with the treatment calculator.

🇷🇴 Romania estimate (2026): test kit ≈ 250–400 RON · TDS meter ≈ 50–120 RON · pH meter ≈ 80–200 RON · change water ≈ 10–80 RON/month · RO unit ≈ 600–1,500 RON one-time · preventive treatments ≈ 30–100 RON/month. Local reference only.

⚠️ A note on medications: dose treatments only when there's a real, diagnosed problem — over-medicating a healthy tank does more harm than good.

💡 Did you know?

A larger tank is often cheaper to run than a small one. In a bigger volume, waste is diluted, temperature swings are slower, and parameters stay stable for longer — which means fewer emergencies, fewer lost fish, and fewer medications. The money you "save" by buying a small tank is frequently spent later on troubleshooting.

❓ Frequently asked questions

What's the minimum tank size for keeping discus?

Plan for at least ~40 liters (≈10 US gallons) per adult discus, so a minimum of about 200 L (≈53 US gallons) for a group of five.

What temperature do discus need?

A constant 28–30 °C (≈82–86 °F). A backup heater and a thermometer with an alarm are strongly recommended.

Is a bigger tank really cheaper in the long run?

Often yes. Larger volumes keep water parameters more stable, which reduces stress, illness and the cost of fixing problems over time.

Where should I buy discus?

From verified local breeders where possible, or reputable specialist stores. Avoid general (non-specialist) pet shops because of the higher disease and stress risk.

🧮 Estimate your own budget: plug your tank size into our monthly aquarium cost calculator for a personalized figure, then browse recommended setups to put it all together.