Have everyone in your group but the tank stand on the mushrooms seen in the pictures. As per other people experiences there is a general warning if you don't evade the skirmishers right away they "may" knock you under the instance heh. Update : They have removed the eggs apparently, however you can still get onto the mushrooms with a little work. Also if you use this please start reping. (Yeah yeah yeah don't ask for rep but getting only 1 rep for a good exploit with 1500 views is pitiful. Don't make me stoop to writing a "MSG a GM exploit")
Potential bypass exploit -
http://www.mmowned.com/forums/wow-ex...a-feature.html
On the pull make sure your tank holds the boss and have someone AoE so all the adds evade bug. That's it easy mode [Watch him die!].
For easy mode Hadronox simply have a person who can drop aggro hit the first pat on the web then leave combat.
Everything despawns leaving you the opportunity to run down to Hadronox and kill him when he spawns getting you another achievement.