Review on AquaClear 20 Activated Carbon Inserts 🐠 for Aquarium Filter, Replacement Media, 3-Pack - A1380 by Joshua Reese

This is a great filter and we use these charcoal inserts when needed. We have found that for our small tank (10 gallons fresh water/one tap) the bioinserts work on their own most of the time. But charcoal is particularly good for cleaning the water after using medication in the aquarium. Charcoal has also been found to be excellent at controlling that "fishy" smell. :) Although we don't use these inserts all the time, this product comes in very handy for occasional use. Highly recommended!