Trying to genetically modify creatures with sea shells

I've recently joined a maker space and they've got a crispr lab.
We're pretty fresh to the whole domain. The guy who pushed the addition of the crispr effort is mainly interested in plants and doesn't know how to approach creatures with sea shells?

How would one go about genetically modifying these creatures?
Is the goal, in general, with any of these projects, to target the creature at conception?

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