Livebearer Benchmarks
Guppies: 1.5cm at 4 weeks, 3cm at 12 weeks, sellable 16 to 20 weeks.
Platies: 2cm at 6 weeks, 4cm at 16 weeks, sellable 20 to 24 weeks.
Mollies: 2.5cm at 6 weeks, 5cm at 16 weeks, sellable 20 to 28 weeks.
Betta Benchmarks
Free swimming at 3 days. 1cm at 4 weeks. 3cm at 12 weeks. Jarring age 10 to 14 weeks.
Color visible at 8 to 10 weeks.
Cichlid Benchmarks
Convicts: 1.5cm at 4 weeks, 4cm at 12 weeks, sellable at 16 to 20 weeks.
Angelfish: 1cm at 4 weeks, 5cm at 16 weeks, sellable at 20 to 24 weeks.
Flowerhorn: 2cm at 4 weeks, 8cm at 16 weeks, grade-sellable 20 to 28 weeks.
Tetra Benchmarks
Most tetras: 1cm at 4 weeks, 2.5cm at 16 weeks, sellable at 20 to 28 weeks.
Warning Signs
Growth 50% below benchmark — inspect water quality and feeding frequency.
Uneven growth (some huge, some tiny) — increase feeding frequency or split tanks.