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Its very curious the way the plankton form a cloud around the light also you can see the bigger organism like copepods and cyclops darting around the cloud I guess they feed on the microscopic fauna

sorry about the glass thats a kind of encrusting algae very difficult to get ride off in the back you can see also a healthy stem of Ruppia maritima growing very well

That's a lot of plant life! Glad to hear that the maritima is thriving!

Interesting. Never saw that before