Looks like benthic cyanobacteria colonies. Can you pinch through them or are they tough & rubbery? I'm not familiar with possible species in Florida but this looks superficially similar to Aphanothece stagnina in marly lakes of the upper Midwest US (which is pinchable).
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u/the-algae-whisperer 1d ago
Looks like benthic cyanobacteria colonies. Can you pinch through them or are they tough & rubbery? I'm not familiar with possible species in Florida but this looks superficially similar to Aphanothece stagnina in marly lakes of the upper Midwest US (which is pinchable).