((install)) — Bottle Biosphere Guide

: Add a thin layer of activated charcoal over the gravel. This helps keep the water clean and prevents unpleasant odors.

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"You aren't trapping them," argues one hobbyist forum post. "You are building them a predator-free paradise where they have infinite food and perfect salinity. They live longer in the jars than they do in the wild." Bottle Biosphere Guide

As old leaves die, microbes in the soil break them down, returning essential nutrients to the earth to feed new growth. 2. Essential Materials To get started, you will need: : Add a thin layer of activated charcoal over the gravel