How to Grow Coralline Algae

Select the type of coralline algae you're going to grow. There are a variety of colors. Since the algae will tint the rocks and tank, it's important to choose the right color from the start.

Change some of the bulbs in the aquarium. Different types of coralline algae thrive with different colored light. Although the color can vary with the type of algae you choose, many will do well with a blue light.

Test the water for calcium content. Coralline algae, much like other organisms in a reef environment, require calcium to thrive. Your test results should be between 350 and 480 parts per million; if the calcium content is low, add some. Also, be sure that there is a low concentration of nitrates in the water -- less than five parts per million.

Introduce the algae to the tank. The easiest way to do this is to scrape the algae from a rock bought at an aquarium supply store into the tank. Be sure to distribute the algae across the entire tank.

Give the algae time to settle. Turn off any filters or other devices that are circulating the water. This will allow the algae to establish itself on the rocks.

Keep an eye on the water chemistry. Make the the calcium content remains high, while the phosphate and nitrogen levels remain low. Chemicals called protein skimmers can be purchased at an aquarium supply store. These will help keep the chemicals at the right levels for the algae.