Worms - A Girl's Best Friends

I recently bought a Gusanito worm bin with 5 trays for my worms.  Originally I had made my own, but I found that it lacked proper room to really spread out the different compost stages.  It also allowed a large number of pests to come in.  My hope is that the new bin will create a friendlier environment for my worms.  So I moved everything from my squat, rectangle wooden bin to a taller bin with a tray system.  After adding the coir, I placed bedding form the original bin with the partially composted food as well as fresh papaya and broccoli stems.  They go nuts for the papaya.  Several posts I've read online have recommended feeding worms coffee grounds, especially since it will add a lot of nitrogen to the vermicompost; however, my worms haven't even touched them since I tossed them in the bin a few weeks ago.  I'll have to watch closely and see if their new environment helps to spark an interest since all of their food is moved around and their bedding has been fluffed and aerated well.  I plan to post some pictures this weekend and leave updates on their status regularly.