Like the [You must be registered and logged in to see this link.] thread, if you eat eggs, you can use the egg shells and turn them into a calcium supplement. Egg shells are made from almost 100% calcium carbonate. This is a natural source of calcium that can be used to fertilize plants.
Materials
1. Egg shells
2. Acid (vinegar, citric acid, etc.)
3. Container
Instructions
Clean the egg shells and place them into a container. Dissolve with vinegar, or a solution of citric acid. Once dissolves, remove the egg shell membrane and discard. Add the calcium solution to the aquarium. Simple.
Egg shells can also be added directly into the aquarium. If the water is acidic, including from adding CO2, the shells will dissolve.
Materials
1. Egg shells
2. Acid (vinegar, citric acid, etc.)
3. Container
Instructions
Clean the egg shells and place them into a container. Dissolve with vinegar, or a solution of citric acid. Once dissolves, remove the egg shell membrane and discard. Add the calcium solution to the aquarium. Simple.
Egg shells can also be added directly into the aquarium. If the water is acidic, including from adding CO2, the shells will dissolve.