Probably algae. you can scrap it off the glass or vacuum it off the sand.
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little white spirals on the glass
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Could be beneficial "
pods" or featherdusters. It is hard to tell with no pics. Can you scrape them off?
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can it just be that purple stuff starting to grow on the back glass of the aquarium.
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Generally this starts off as a very bright green color.
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if not, how do i get that purple stuff?
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It will grow by its self.
BTW, how are your fish doing?