Reefara › Troubleshooting

High Nitrates in a Reef Tank: How to Lower Them Fast

Nitrate above 20 ppm stresses corals and fuels algae. Here's how to bring it down, and how to stop it from climbing back up.

Reefara is a reef-keeping reference site covering tank setup, equipment selection, water chemistry, livestock care, and troubleshooting. Whether you are planning your first nano reef or upgrading to a 200-gallon mixed reef, our guides, calculators, and species encyclopedia are here to help you make better decisions.

Browse the beginner's path if you are new, the buyer's guides for equipment recommendations, the species encyclopedia for livestock, the reef tools for calculators and planners, and the troubleshooting hub when something needs fixing.

All equipment recommendations are based on tested products and real-world hobbyist feedback. Affiliate relationships are disclosed on every applicable page.