Reef Tools & Calculators

The two questions behind every reef build are "what turnover, skimmer and PAR suit my tank?" and "how much salt and dose do I need?". These free, interactive calculators answer both from the numbers — turnover rules by coral type, skimmer-rating-to-tank-size guidance, PAR-by-coral targets, the watt-per-gallon heater rule, and generic dosing-rate math. Each carries a "How this is calculated" note and a parameter-not-prescription disclaimer. No review claims — just the data, and it's general reef-keeping information, not veterinary advice.