As to what other inhabitants are in the tank, aside from the astrea and nerite snails, a few scarlet hermits, few blue hermits, one electric blue hermit, many tiny seastars, 2 cleaner shrimp, 1 pistol shrimp, 2 ocellaris clowns, 1 flame angel, 1 yellow tang, and 1 yellow goby.
I do have a corals and a rose anemone, but cannot imagine them producing an eggmass like this. However, the hatched critters appear similar to the planula larval stage of cnidarians.
Unfortunately I don't have a better picture. I did get a sample last night. By this morning there were tiny critters swimming around (so they were viable). When I observed them with a microscope they were cilliated and about a 1/4 mm long. It appears that most all of them have hatched in the tank. I have a vial of a few of them, not sure what to do with them.
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