Just want to add my experience and corroborate some of the information found here. I camped the ~60s spawn for about 4 hours, never saw a single tainted. Came here looking for more info, found the 3 spawn points noted in other posts here, which were all 6 min spawns
-824, 143
-900, -830
-1351, -761
Over the course of ~6 hours, I had killed probably 7 or 8 tainted barracudas, and all of them were light blue to my Druid (50 Druid), but the tainted that finally ended up spawning the corrupted barracude was dark blue (level 46 specifically), and spawned at the -900, -830 ish location. Of all the tainted/corrupted spawns in the epic, this one took me the longest BY FAR at roughly 6 hours. Definitely the most annoying one I had to deal with.
Yelinak TLP, Luclin Era
12/23/2022