Algae are very diverse groups of most unicellular organisms. Many of the few groups of algae are not even closely related so it is easier to understand why they can take various forms of development, patterns, and reproductive plans among other differences.
They are not plants, even multicellular species do not have organizations and special standards of plant cells. However, algae usually operate substantially in the same way, by collecting simple nutrients from the surroundings and turning them into food through photosynthesis. Overall the requirements of algae are quite easy and controlling this is important. You can also purchase algae removal products online via https://chemron.com.au/shop/sanitising/algae-died-b/.
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First or important truth: all tanks have algae, even healthy. This is a natural part of the environment that you are trying to reset and try to delete. It is a war that you won't win. The aim is to try our best to regulate the development and hopefully promote a less invasive species that will not take over the tank. Let algae grow like in the rear glass it will walk far to keep everything else.
Algae is a fairly easy form of life with some fairly basic needs. The three main things needed to develop are light, water, and food supply. Obviously, being an aquarium, controlling access to algae to water is from the table. However, the other two can be controlled using various approaches to prevent or eliminate algae problems.