Complete Discus Care Guide: Tank Setup, Diet, Tankmates, Lifespan
Complete care guide for Discus. This article covers everything an aquarist needs to know about keeping Discus successfully - from initial tank setup through advanced breeding, with parameter targets, sourcing recommendations, and troubleshooting protocols.
Discus biology + natural habitat
Discus is one of the most-kept aquarium species. Understanding the wild habitat informs every decision in captive care - water parameters, tank size, social structure, diet, and tankmate selection. Browse our full species page for the technical care sheet.
For taxonomic + ecological data, check FishBase + IUCN Red List.
Wild populations have specific habitat requirements that translate directly to captive care. Match the wild conditions and the fish thrives.
Tank size + water parameters
The minimum responsible tank for Discus depends on adult size, activity level, and territorial needs. Use our stocking calculator + tank volume calculator for precise sizing.
Use our water parameter checker to score your readings against the species' target range.
Stable parameters beat ideal-but-fluctuating parameters. A swing of 2°F or 0.4 pH stresses fish more than chronic suboptimal-but-stable values.
Filtration + lighting
Use our filter turnover calculator to size filtration. Most freshwater species need 4-6x tank volume turnover; reef species need 20-40x combined return + powerhead flow.
For lighting, use our PAR estimator if keeping coral or planted-tank species. Photoperiod 6-10 hours typical.
Diet + feeding schedule
Diet variety matters dramatically. Single-food diets are the #1 nutritional cause of death after water-quality issues. Rotate 3-5 different foods across each week.
Use our food guides by species for specific recommendations + feeding schedules.
Tankmate compatibility
Use our tankmate compatibility guides + stocking calculator to plan tankmate combinations safely. Always research adult size + territorial needs before adding new fish.
Common diseases + prevention
The most common diseases include parasites (ich, velvet, flukes), bacterial infections (fin rot, columnaris, dropsy), and fungal issues. Use our symptom matcher to identify diseases + our disease database for treatment protocols.
Prevention: 30-day quarantine for all new arrivals, varied diet, stable parameters, no aggressive tankmates. Use our QT timeline calculator.
Sourcing + where to buy
Choose captive-bred over wild-caught when available - acclimation is faster, immunity stronger, lifespan longer. Top breeders depend on species; browse our originator directory.
For state-by-state legality, check our legality directory. Browse current vendor inventory in our Discus species page.
Frequently asked questions
What size tank does Discus need?
Minimum tank size depends on adult size + activity level. Most peaceful community fish need 20-30 gallons; larger predators need 75+; schooling species need group of 6+ which scales tank size accordingly. See our tank stocking calculator.
What water parameters does Discus prefer?
Specific parameters vary by species. Most tropical freshwater fish: 76-78°F, pH 6.5-7.5. Reef tanks: 78°F, salinity 35 ppt, pH 7.9-8.4, alk 7.5-9.5 dKH. See our glossary for parameter definitions.
What does Discus eat?
Diet varies by species - carnivores need 40%+ protein, herbivores need under 30%, omnivores split. Always rotate 3-5 different foods. See our food guides by species.
How long does Discus live?
Lifespan varies dramatically by species - some livebearers 1-2 years, large cichlids 10-15, koi 25-50. Captive-bred typically outlive wild-caught due to better acclimation. See our Q&A library for species-specific lifespan data.
Can Discus be bred in home aquariums?
Many species breed readily in home aquariums (livebearers, killifish, some cichlids, clownfish, some shrimp). Others are difficult or impossible. See our breeding basics guide.
Related on Fast Aquatics
Species page: Discus care sheet for technical specifications + current vendor inventory.
Calculators: tank stocking · tank volume · water change · heater wattage · filter turnover · QT timeline
Tools: water parameter checker · disease symptom matcher · equipment budget builder · aquarium problem diagnoser
References: Q&A library (222 entries) · glossary (127 terms) · disease database (50) · care library · state legality · originator directory
External authority sources: FishBase · IUCN Red List · AZA accredited institutions · Monterey Bay Seafood Watch · USFWS
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