Why Is My Aquarium Water Brown? Tannins, Waste or the Water Source

Moss on driftwood in an aquarium

Brown aquarium water is often tannins leaching from driftwood, leaves and botanicals, which Aqueon says aren’t dangerous to fish. It can also come from decaying food, plants or waste, so test ammonia and nitrite first.

Why Is My Fish Aquarium Water Cloudy: Fix It Fast

Why Is My Fish Aquarium Water Cloudy

Learn why is my fish aquarium water cloudy and how to clear it fast with easy fixes, filters, and maintenance tips to save your fish and restore crystal water.

Why Use Activated Carbon In Aquarium: A Clear Tank Guide

Why Use Activated Carbon In Aquarium

Thinking about how to use activated carbon in aquarium? Learn how this powerful filter media removes odors, discoloration, and toxins for a crystal-clear, healthy tank.

Why Use Carbon in an Aquarium Filter? What It Removes and How to Run It

Planted aquarium with driftwood and moss

Activated carbon pulls tannins, phenols, odors and medications out of aquarium water. It does nothing for ammonia, nitrite or nitrate, so it is optional. Guides run it last; follow your filter’s manual, and replace it as its maker directs.