Hamza's Reef Aquarium Calculators

Hamza's Reef gathers dozens of small calculators that answer concrete aquarium questions. The collection covers free ammonia, freshwater and marine CO2, alkalinity conversion, salinity correction, calcium-reactor and kalkwasser contribution, reverse osmosis, water changes, heaters, tank weight, substrate and actual system volume. Most pages expose the variables and describe their assumptions, so the result is easier to audit than a single unexplained recommendation. Selectable units also reduce manual conversion mistakes.

These are mathematical models, not test kits or dosing instructions for an unknown aquarium. A kalk result, for example, assumes a particular solution strength and excludes some preparation methods; volume and salinity errors propagate directly into a dose. Several pages rely on established hobby chemistry rather than a recently published validation study, and the site has no prominent changelog. Use the tools to check arithmetic after measuring the tank, then increase any chemical addition gradually and retest rather than treating the output as an automatic command.