there is some form of lime green corraline and that's good stuff. However there is also a light green type of algae that grows which is not corraline. I would need pictures. I have some of the "non coraline" on my glass. I thought it was corraline at first but it's not as "rough". .
If it looks anything like this, it's coralline algae. Mine starts out as a pale green, goes to lime green, then to pale blueish-green and then to a lavendar color.
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