Hi Beano,
First off, congrats on finding your pompom crab with eggs! Do you have 2 crabs or just the one? Its always exciting to observe the natural world up close.
Unfortunately, and I hate to tell you this, many types of marine crabs go through a free floating "zooplankton" like phase right after they hatch. And generally speaking, the smaller the crab species, the smaller the hatchlings. So basically your pom pom crab babies, if they hatch, will be as small as the plankton they need to feed on. So there is no way to properly feed newly hatched crabs in aquaria, let alone a pico sized tank. Even in large 100+ gallon aquaria, there just isn't enough naturally occurring food for them to feed on in the water column and any attempts to add artificial or natural microscopic food like phyto will only result in polluting your tank since its so small.
The best thing that happens is if the eggs hatch (depending on weather they were fertilized by a male) is that there will be natural food for the mature critters and corals in your tank. Hope that helps.
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