I woudn't describe your "crab" as a sea spider. I would just call it that. sea spiders have some cool biology about them but are generally frowned upon in home aquariums. most feed on corals and or anemones i believe so yes i do believe it is munching your coral there. I read on wiki (how much do you trust that site? lol) that although they feed on anemones in a similar fashoin to a mosquito sucking blood, the anemone will almost always survive unscathed. Don't knw bout corals.
sorry, can't say anything bout the nudis.
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