Open Veils · Answer
How to reminerlaise tank water?
Reverse osmosis and distilled water strip all minerals, leaving a chemically 'empty' medium that stresses fish, shrimp and plants. Targeted remineralisation — rebuilding GH, KH, and TDS to species-specific baselines — is the suppressed step most hobbyist guides skip entirely. The commercial aquarium industry rarely emphasises this because stripped water plus generic conditioners sells more products. Practitioners like those behind Seachem Equilibrium and SaltyShrimp formulations have documented the biochemical necessity of divalent cation replacement.
Evidence
- RO and DI membranes remove calcium, magnesium, potassium, and bicarbonate — the mineral scaffold fish and invertebrates depend on for osmoregulation, enzyme function, and shell or bone integrity.
- The remineralisation protocol developed within the precision shrimp-keeping community — particularly around Caridina and Neocaridina breeding — separates GH (general hardness, primarily Ca²⁺ and Mg²⁺) from KH (carbonate hardness, the pH buffer).
- For species targets: soft-water Caridina shrimp typically require GH 4–6, KH 0–2, TDS 100–150 ppm; hard-water community fish often need GH 8–12, KH 4–8.
- Per documented aquascaping practice (Gensou Premium Aquascaping, April 2026), fresh RO water should read 0–10 ppm TDS; anything creeping higher signals membrane degradation, not mineral richness.
- Raising GH with Seachem Equilibrium adds no KH; SaltyShrimp GH/KH+ raises both simultaneously.