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Old 05-13-2018, 07:33 PM   #1
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Black Algae?

Found this in a clients tank. Black algae? It hasn't killed anything but it also wasn't touching anything. There were two nice size pieces.

Also, do you think that's aiptasia or a duster. She has a nice size aiptasia crew and established tangs. Thanks.Click image for larger version

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Old 05-13-2018, 09:07 PM   #2
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Some kind of sludge. I just siphon it out.
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Old 05-14-2018, 05:51 PM   #3
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That is a feather duster for starters.
As for the black, can it be blown off? All I see is a sponge. It can be nice or a nuisance, depends on your point of view.
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Old 05-14-2018, 09:54 PM   #4
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Feather duster and cyanno..
It is not always red .
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