Neocaridina Culling Guide: Maintaining High-Grade Colour

Selective Breeding: Even high-grade colonies naturally produce offspring with lighter pigments, stripes, or clear patches.
Preserving Lineage: Culling simply means separating lower-grade shrimp from your primary breeding group to keep the gene pool concentrated and vibrant over generations.

Wait Until Maturity: Do not cull juveniles. Shrimp pigments intensify significantly as they mature (around 1.5–2 cm / 2–3 months old).
Key Traits to Inspect:
- Colour Coverage: Look for solid, opaque coverage across the entire body, including legs and antenna bases.
- Translucence: Remove shrimp showing clear/fleshy patches or weak, washed-out tones (unless breeding for specific wild/rili traits).
- Pattern Consistency: For graded lines (like Painted Fire Red or Green Jade), select against thin or patchy shells.

Never Kill Healthy Culls: Culling doesn't mean destroying the shrimp.
Dedicated Skittles/Community Tank: Move lower-grade shrimp to a secondary "Skittles" or display tank where they can live out their lives peacefully without altering your main breeding line.
Keep Parameters Identical: Maintain standard Neocaridina parameters (pH 6.8–7.8, gH 4–10, kH 2–8) in both tanks so transferred stock thrives without stress.

Regular Sweeps: Inspect and sort the colony every 4–6 weeks before juveniles reach breeding age.
Colour-Enhancing Diet: Supplement regular feeding with carotenoid-rich foods (spirulina, astaxanthin) and botanicals (Catappa leaves) to support vibrant shell pigmentation.
Good Lighting: Quality LED lighting not only brings out natural pigments but makes spot-checking grades far easier.