Phosph8 is a clean, highly soluble inorganic phosphate supplement designed to correct ultra-low PO₄ and stabilize nutrient balance in modern reef aquariums. Maintaining a small, consistent phosphate level supports zooxanthellae metabolism, coral coloration, polyp extension, and a healthier microbial community—especially in ULNS systems with heavy export (skimmer, refugium, GAC/GFO).
Ultra-pure, reef-safe phosphate—mixes clear with no dyes or perfumes
Fine control for micro-adjustments; ideal for SPS-dominant systems
Helps prevent “zeroed nutrients” issues (pale tissue, stalled growth, nuisance dinos tied to starvation)
Plays nicely with carbon dosing and trace programs when used as directed
Two sizes for nano to large systems (60 mL dropper, 355 mL bottle)
Always test PO₄ before and 30–60 minutes after dosing. Typical mixed-reef targets: ~0.02–0.08 ppm (tune for your system).
Start low: Add 1 drop (~0.05 mL) per 25 gal (95 L), wait, and re-test.
Creep to target: Repeat small additions until your target is reached.
Stabilize: Maintain with daily micro-doses based on your tank’s consumption rather than large, infrequent additions.
Application: Dose into a high-flow area or sump; avoid simultaneous dosing with high-pH additives—separate by 5–10 minutes.
Pro tips
If using GFO or other PO₄ binders, reduce/temporarily remove while raising PO₄; media can instantly strip additions.
Do not use alongside lanthanum chloride flocculants.
If PO₄ overshoots, pause dosing and rely on export/water changes until you’re back in range.
Safe for corals, clams, and reef-safe fishes when used as directed.
Compatible with Ca/Alk/Mg regimens, bacterial supplements, and carbon dosing (monitor your NO₃:PO₄ balance).
Ultra-pure inorganic phosphate in purified water.
Store at room temperature, away from light. Do not freeze.
Shake gently before use. Keep out of reach of children and pets.
Product: Captiv8 Reef BluePrint – Phosph8
Function: Raises/maintains phosphate (PO₄³⁻)
Format: Liquid
Sizes: 60 mL dropper bottle; 355 mL bottle