I have speculated about coccolithophores before, but didn't even try to take a look under a conventional microscope due to their small size. If you search for a picture all the identifiable ones are taken with an electron microscope.
I've found some larger calcareous particles sitting on the rocks, but it's hard to figure out if they are produced in the tank or came with the sand. Even though the water looks clear I do have a lot of large floating particles.
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