collecting the Capillary from a shared/guild bank doesn't update the quest. It must be collected from mail, bought from broker, removed from your own broker, or traded from another character. Quest will update if it is sitting in your bank or in your bags on your character when you speak to Toranim.
Obtain 6 Phosphorescent Pearls, a fairly common update from deep spawn consorts in Loping Plains. You will find them on the beach on the small wooden platforms, as well as a few wandering on the beach. Killing one does not guarantee an update and each has 5 min respawn.
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