Algae ID help

  • Thread starter Thread starter K9Fish
  • Start date Start date
  • Tagged users None
Once when replacing some old rockscape for diver collected rock, I noted numerous cryptic sponges on
”dark side” of the rock.

75G display on top and 30G cryptic refugium with mud filter on bottom.

Last picture is 30G fishless sponge tank.
 

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What is the white stuff growing on sump wall? I’ve been told algae and also suggested it was a sponge. Is it invasive, good filtration? Should I let it be or get rid of it?????
Perhaps mini feather dusters which to me are good bioindicators of a healthy system.
 

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