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They can eat duckweed, elodea or algae.
lotus, lilies,algae are few examples.
Duckweed
Some types of floating plants do not have roots.
Water lilies, cat tails, water iris, duckweed, algae, etc
They'll eat algae or freshwater aquatic plants such as anarchis or elodea
because you're stupid
this may go from the simplest of fish to the most extreme plankton
Elodea is not sterile and they will have bacteria, algae, and even protozoans on the leaves and stems. However, the bacteria and the protozoans will use the oxygen to dissolve into the water.
The answer would be yes and no. Generally there are many different animals that do eat duckweed, ducks, carp, etc. However, Duckweed, (most notably native to California) is more often found in fresh water in ponds or lakes. There are also three main types of Duckweed, Lemna, Wolffia, and Spirodela. Each of course being slightly different than the other. Duckweed was often noted as being a good source of calcium, but the calcium make-up is sometimes unusable, especially by humans, mostly depending on the environment in which it is grown. Water content changes the content of the Duckweed. It is often said that it is better to eat that which eats the duckweed. So for as far as sharks go, they do not specifically eat duckweed (this includes the algae and shrimp eaters), however they would certainly benefit from it if it were injested.
no,algae eater only eat algaewhy do u think their called algae eaters
red algae can be when you scratch it and then when you scratch it to much there can be a problem!