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Adult size + growth rate
How big does a Discus get?
TL;DR Discus grow 6-8 inches diameter. Premium German lineage discus reach 8 inches. Wild specimens slightly smaller (5-7 inches).
Growth timeline Stage Size Juvenile 1-2 inches (purchase) Six Months 4-5 inches One Year 6-7 inches Adult 6-8 inches
Factors that affect maximum size Daily 25-50% water changes during growth High-protein varied diet (mysis, beef heart) Tank size 75g+ for full growth Lineage (German vs Asian breeders) Tank size requirement 75+ gallons for adult group
Full Discus care guide Browse the full Discus care guide for water parameters, diet, tankmates, and breeding details. Use the stocking calculator to plan around adult size, not juvenile size.