Saltwater reef aquariums, made simple
Making Reefing Easy
Free tools, honest advice, and a community for saltwater reef hobbyists — from your first tank to your thirtieth frag.
The Toolbox
Six tools that make reefing easier
Free. No sign-up. Built by hobbyists who got tired of doing the math on a napkin.
New to reefing? Start with Reef School →Reef Calculator
Dosing amounts, salinity checks, alk trends — all in one place.
OpenPAR Estimator
Estimate PAR at any depth for popular reef lights.
OpenStocking Planner
Plan a stable bioload before you add that third tang.
Open NewDino ID
Identify dinoflagellate blooms from a photo.
OpenPest ID
Aptasia? Planaria? Bristleworm? Find out fast.
OpenICP Analyzer
Paste in an ICP result — get plain-English actions.
Open
Fresh from the community
See what other reefers are up to
New videos, tank shots, and posts from the ReefDudes community.