Freshwater Fish and Saltwater Fish

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Blue-green algae isn’t technically an algae in the proper sense of the word – it’s actually a form of bacteria, called cyanobacteria, which is a type of bacteria capable of photosynthesis.
Cyanobacteria is one of the oldest organisms known in the world, and is estimatedt to have been around for at least three.five billion years!
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I’ll try and not get too technical here.
Algae (pronounced AL-jee) are simple forms of marine plant life.
They’re pretty basic: they lack leaves, roots, flowers, seeds, and all the other things we normally associate with plants.
The term ‘algae’ is an umbrella phrase that’s used to refer to all forms of marine life that [...]