Clean, well-maintained saltwater reef aquarium with healthy corals

Weekly Reef Tank Maintenance Checklist (Plus Daily, Monthly and Quarterly Tasks)

A healthy reef is built on boring habits. The tanks that thrive are rarely the ones with the fanciest gear; they are the ones whe...

Close-up of a healthy stony coral with pale growing tips in a reef aquarium

Reef & Marine

Reef Water Chemistry Explained: Alkalinity, Calcium and Magnesium

Most reef problems that look like a coral problem are really a chemistry problem. Learn three numbers and how they move together,...

Reef aquarium with zoanthids, mushroom corals, a leather coral and a brain coral

Reef & Marine

Best Beginner Corals for Your First Reef Tank

The best first corals are not the rarest or the flashiest. They are the ones that forgive a missed test, a small swing in salinit...

Newly set up saltwater reef aquarium with live rock arch and white sand

Reef & Marine

Saltwater Reef Tank Setup Guide: From Empty Glass to First Coral

A reef tank is not hard to set up, but it punishes shortcuts: nearly every dead coral story starts with a skipped leak test, tap ...

Saltwater reef aquarium with a purple and green brain coral, an LPS coral and a zoanthid colony

Reef & Marine

Coral Care 101: Types of Reef Corals and How to Keep Them Thriving

Corals look like rocks, behave like animals, and eat like plants, which is exactly why they trip up new reef keepers. This guide ...

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