here is a long discussion on the subject. it's probably better to precompost your peels first before adding them to the worm bin

http://vermicomposters.ning.com/forum/topics/banana-peel-experience

I have been putting banana peels in my bins for 6 months and the worms are doing great--they're multipying like crazy and I haven't noticed any strange looking worms that might have been affected by pesticides.

I will have to check out the website mentioned, though.

I should probably add that I don't peel the banana and toss the peels into the bins. I mix them together with my vegies and then freeze them. I have not found any peels (even the stem) left in the bins.

I just read some of the comments in that thread on banana peels. Some of the comments were on the lack of their worms increasing like they thought they should. I started with 1000 worms in an 18 gal. bin in Oct. 2010 and now have 3 -18 gal bins which are loaded with worms--adults, juveniles, babies, cocoons. I tried an experiment with 20 adults in a small box. After 3 months I had over 400 adults and juveniles--and they ate banana peels.

If you just don't know what to do because you're still leery of the peels, I'd add just toss the peels.

I was the original poster of the discussion cited. After 2 years, I still had less than a pound of worms. I stopped adding banana peels and noticed and explosion. I haven't checked them in the 2 weeks since I initially posted because I don't want to disturb them. I'll check next week and post an update on vermicomposters. I think it very much depends on where in the world you are and where in the world your bananas come from. I froze my banana peels (fruit flies are in most peels in Hawaii) and added them with lots of other things.

I like the fact that you checked it out with a small box. Based on hearing lots of stories like yours on the amazing growth of their worms, you can see why I might be frustrated after 2 years. Think of making your next bin a flow through. The harvesting is easier.