| Category | Item | Notes | | :--- | :--- | :--- | | | 1-2 liter clear glass bottle or jar | A wide mouth (e.g., pasta sauce jar) is easiest. A carboy (fermentation bottle) looks impressive but requires long tweezers. | | Drainage | Small pebbles or gravel | Washed thoroughly. | | Filtration | Activated charcoal | Crucial. Prevents mold and removes toxins. Available at pet stores (aquarium section). | | Barrier | Window screen mesh or moss | Keeps soil from sinking into the gravel. | | Growing Medium | Potting soil | Use sterile, organic potting mix (no chemical fertilizers or perlite—perlite floats and looks ugly). | | Plants | Small, slow-growing, humidity-loving plants | See list below. | | Water | Distilled or rainwater | Tap water contains chlorine and minerals that build up. | | Tools | Chopsticks, tweezers, small funnel | For arranging inside narrow necks. | | Cleanup Crew | Springtails (optional) | Tiny bugs that eat mold. The single best insurance policy for a healthy biosphere. |
| Component | Purpose | |-----------|---------| | Clear glass or PET plastic bottle (1–2 L) | Container; glass preferred for scratch resistance | | Natural pond water or dechlorinated tap water | Aquatic biosphere base | | Pond sediment / garden soil (sterilized optional) | Nutrient source and microbial inoculum | | Aquatic plants (e.g., Elodea , Ceratophyllum ) | Oxygen production, habitat | | Small aquatic snails or Daphnia | Grazer / consumer | | Springtails / small earthworms | Terrestrial decomposition | | Activated charcoal (optional) | Filters toxins, reduces odors | | Cheesecloth + rubber band | Initial aeration if building semi-closed | | Light source (LED grow light or indirect sunlight) | Energy input | | Magnifying glass / USB microscope | Observation | | Notebook, camera | Data recording | Bottle Biosphere Guide