These are Aaron's Undersea Discovery marbles, somewhat impossible to photograph, and with a lot more to see in hand compared to what the lens can catch.
Marble #1 - 1 7/8"
These are 'flagellate feeding tubes feeding on reef particles'.
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Some sweet fuming going on here!
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Marble #2 - 2 1/8"
Tons to see in this one, the nicer of the two.
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Here is a school of tiny silver fish.
The various jellies and other organisms are over on the sides.