Well this have to be done AFTER you clear instance with your guild. Since Blizzard did give 3 days reset time no mobs are respawned (almost none) and this give you oportunity to go inside and kill easy mobs like Silicate Feeder http://www.thottbot.com/?n=936773 who drops Idols, Scarabs and Larval Acid. Silicate Feeder are located near 5th boss (Ayamiss the Hunter) and can be soloed but watch not to pull flying packs or 2-3 Feeder.

Path to come to Ayamiss the Hunter room is Entrance > Genral Rajyxx room > Moam room > Ossirian the Unscarred room (watch for spawned mobs keep to the wall) > Stairs to Ayamiss the Hunter room

Next thing are Vile Scarab's gray mobs located anywhere in AQ20 and respawned fast, they can drop Scarab coffer key which will allow you to open Scarab Coffer http://www.thottbot.com/?n=959084 and get some phat loot (note I only once got key it is really low % chance).

If you grind for quest items it is really nice loot and if you grind for money Idols on my server goes for 80g, Scarabs 20-30g.

NOTE: You have to be in raid to enter instance

EDITED:
Just found out after you kill Ayamiss the Hunter no Silicate Feeder are respawnd , apologise was our first kill lastnight :(
BUT most of guild forget so called SAFE ROOM you can see it on Atlas map and it is fill with Silicate Feeder but little hard to explain how to go there. Basicly you go from entrance >> General Rayaxx room >> Burru room >> follow path to Ayamiss the Hunter and on entrance you will see a bridge which you pass under , go to left side of bridge and jump on it , wallk ower bridge and on other end you will see a room filled with Silicate Feeders.