Reef Toolbox
Small calculators for the questions that come up while you are standing in front of the tank. Everything runs in your browser — no account, nothing saved, nothing sent anywhere.
Flow & turnover calculator
Your powerheads and their settings, against your display volume — total in-tank flow, turnover, and whether that lands where your corals want it.
Open the calculator →PAR estimator
How far the light has to travel to reach a coral, and roughly what that leaves it sitting in — with the uncertainty shown rather than hidden.
Open the calculator →Dosing calculator
Alkalinity, calcium or magnesium from where your tank is to where you want it — as dry Balling salts or a bottled two-part.
Open the calculator →Pest eradication guides
Aiptasia, bryopsis, dinos, flatworms — what it is, and a method with a source behind it rather than forum folklore.
Find your pest →Log your tank and these stop being generic — the calculators read your saved volume and your last test result, and the flow and PAR tools answer against the corals you actually own rather than corals in general.
Fighting something instead of tuning something? The pest guides carry a sourced method for each one, and the products that actually do the job.