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Re: black spot algae
>Reid Kerr <rkerr at netcom_ca> asked about black spot algae. I think
>this might also be the same as something sometimes referred to as
>green spot algae. In point of fact, there may be several species of
>algae which fit this description.
>I don't know what the scientific name of it is. Some type of this
>algae seems to be present in soil or else it has escaped my bleaching
>attentions. I find that it spreads under the early stages of some of
>my soil tanks when the iron levels may be at their highest. It won't
>go away on its own and is not eaten by anything so you have to remove
>the affected leaves gradually and let new ones grow in as
>replacements. Strong light seems to encourage growth of this on
>leaves near the watersurface.
The genus Coleochaete, a green alga, is epiphytic on aquatic plants.
This is the familiar "green spot" algae we find in our aquaria, and
there are several species native to North America. A microscopic
image can be found at:
I believe it appears black whenever it becomes sufficiently thick.