16 man nightmare
KP:
Bonetrasher: 0 tanks
Jarg/Sorno 3 tanks
Foreman Crusher: 2 or 3 tanks (3 is the best)
Puzzle: Minimum 2 tanks
Karagga: 1 tank
EV:
Annihilation droid: Minimum 2 tanks
Gharj: 1 tank (+1 if you want aoetaunt on adds)
Pylons: 2 tanks (atleast if you do the safe way to avoid pylons bugging)
Council: lol
Soa: 2 tanks to avoid despawning
Most fights on 16 requires 2 or 3 tanks, we usually run with 3 tanks each raid. Seems pretty fine to me.