Dispose 8 of the goo appearing near the sifaye budlings in order to improve their chances of survival.
They're the clickable thing near non-aggro faye called 'a marsh bubbler'
These are random spawns. If you have tracking (which is now purchasable by anyone, they show up in the tracking window in white as 'a marsh bubbler'. Also, they look similar to a bloated marsh muck. Some previously known locations are: