Blue-green algae are technically not algae at all in fact they are a bacteria. Due to fact they are aquatic and make their own food they are considered an algae.
This group of bacteria is called the Cyanobacteria.
The Blue Green Algae are very small and single celled but can grow large enough to colonies your saltwater aquarium. their colours can vary from a\black to red though to purple.
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Like a lot of bacteria, these type of algae in your substrate are beneficial to the health of your saltwater aquarium. They feast on detritus (organic wastes).
They form a dark brownish-red gelatinous mat called red slime which can result from poor water quality, high nutrients level and poor water circulation.
They can form on rocks, gravel, and plants in your saltwater aquarium and produce toxins that poison the saltwater aquarium fish. They must be physically removed with a siphon during a partial water change.
There are several products readily available on the market nowadays to help eliminate slime algae, but the key is to stay on top of your water chemistry, water changes, and water motion or circulation.
For more information on commn types of Algae's see below:
For general information on Saltwater Aquarium Algae click here.
Recommended Algae Products by Saltwater Aquarium Guide
Text and Photo Source: Saltwater Aquarium Online Guide
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