Multiple choice

The algae resembling the black carpet is

  1. staghorn algae

  2. black brush algae

  3. green spot algae

  4. green thread algae
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This algae resembles small tufts of black hairs, or a black carpet. It usually forms on slow-growing plants such as Anubias, but it can also grow on gravel.

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