About Discus
Symphysodon is a small genus (3 species: S. aequifasciatus, S. discus, S. tarzoo) of South American cichlid native to the Amazon basin. Wild Discus inhabit slow blackwater systems with soft, acidic water rich in tannins. Captive breeding over 60+ years has produced dozens of color and pattern strains, with prices from $80 entry-level to $500+ for premium graded specimens.
Care parameters
The non-negotiables
- Group of 5+: Discus are schooling. Single specimens get bullied; pairs form unfavorable hierarchies. 5+ disperses aggression.
- Daily feeding (sometimes 2-3x): Beefheart blends, frozen bloodworms, brine shrimp, prepared discus pellets. Discus are heavy eaters.
- Aggressive water changes: 25-50% twice weekly minimum. Discus excrete heavily; water quality drops fast.
- Quiet location: sudden movements stress Discus. Place tank away from foot traffic and TVs.
- Temperature 84F+: immune function suffers below 82F. Heat is non-negotiable.
Named strains
The captive-bred Discus economy includes:
- Heckel Discus (S. discus) - wild form, vertical blue stripes, premium
- Blue Diamond - solid metallic blue body
- Marlboro Red - solid bright red
- Pigeon Blood - white body with red pigeon markings
- Snakeskin (Royal Blue, Red Snake) - tight pattern markings
- Leopard / Leopard Snakeskin - heavy pattern coverage
- Solid Blue / Cobalt / Turquoise - single-color strains
- Pink Diamond, White Butterfly, Snow White - pale strains
- Wild Heckel, Wild Brown, Wild Tefe Green, Wild Royal Blue, Wild Alenquer - wild-collected variants commanding premium pricing
The Discus disease problem
Discus are disease-prone. Common ailments:
- Hexamita (Hole in the Head): internal parasite. Treat with metronidazole.
- Gill flukes: Praziquantel treatment.
- Discus plague: stress-triggered systemic infection. Quarantine, antibiotics, water quality.
- Internal parasites (general): deworm prophylactically when adding new stock.
Discus require strict quarantine for any new addition. A new Discus added to an established colony without QT is the most common cause of full-tank disease outbreaks.
Compatibility
Best tankmates: cardinal tetras, rummy nose tetras, sterbai corydoras, large Apistogramma, German Blue Rams (parameter-matched). Avoid: angelfish (different size aggression), most barbs (fin nipping), any cool-water species (Discus needs heat).
Pricing tiers
- Asian-bred entry strains (3"): $40-80 per fish
- Mid-grade strains (4"): $100-200 per fish
- Premium strains (5"): $200-500 per fish
- Wild-caught varieties: $200-1,000 per fish (rare strains)
- Show-grade specimens: $500-2,000+ per fish