Calculator-first reef care

Dial in your reef tank without the guesswork.

Brand-agnostic dosing, sizing, and stocking calculators - backed by real care guides. Built for people who'd rather run the numbers than guess and hope.

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Alkalinity Dosing Calculator

Current dKH

7.8

Target dKH

9.0

Recommended dose

42 mL / day

Flagship tools

Every build decision, one calculator away.

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Two-Part Dosing Schedule

Build a daily calcium/alkalinity dosing plan for your tank size.

Protein Skimmer Sizing

Match skimmer capacity to your tank volume and bioload.

Livestock Compatibility

Check any two species before you add them to the same tank.

Latest guides

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Water Chemistry

Why Your Alkalinity Keeps Swinging (And How to Stop It)

Common dosing mistakes that cause chemistry instability, and the fix.

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The acute reef-tank triggers, and the real recovery window before it's too late.

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Reviews

Best Protein Skimmers for Reef Tanks (2026)

Brand-agnostic picks compared by tank size, noise, and maintenance.