Also dropped Thaddius on first try too
They are in the Abomination wing, I think there was a write up on it.. let me see if I can find.

[*]Grobbulus hard - Very Hard, this fight is not a multiboxing fun fight. He will constantly place a disease debuff on a random person in the party giving them 7 seconds to run away from the raid before it goes off. It does quite a bit of damage but most importantly leaves a poison field on the ground that starts out small and then expands so it's crucial you run to the correct spots to drop this off. It can happen where your characters keep getting called and you need to be able to individually control them and run them away, while still maintaing decent DPS in order to drop the boss before it gets out of hand. This fight will definitely not be easy for most, and you may have to drop a few characters if it just isn't working out too well.