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There are 7 main types of algae (but more do exist) that aquariums can have. Brown algae. Brown Algae. This will probably be the first type of algae any one will encounter in the aquarium and could appear from early on and will normally disappear when the tank stabilises and becomes more mature. Brown algae could be in the form of a fluff like or spot appearance on plant leaves, rocks, glass, substrate or decorations.
Freshwater Fish That Eat Algae. Many freshwater tropical fish are great algae eaters in their own rite. Livebearers including Black Mollies, Fancy Guppies, Platys and swordtails eat string algae and sometimes white beard algae. Guppies and Endlerâs Livebearers also do a number on the green algae in a tank.