Most bottle biospheres fail in the first 30 days. Here is your troubleshooting guide.
Pour in your pebbles or gravel. Spread them evenly. For narrow-necked bottles, roll paper into a funnel shape. Rinse the gravel first if it appears dusty. Bottle Biosphere Guide
Despite being "self-sustaining," a bottle biosphere requires observation. Most bottle biospheres fail in the first 30 days
Because this is a guide for a sustainable bottle biosphere, you need to know what happens in year three. Bottle Biosphere Guide