I do not have rocks at the bottom of any of my bins. What do you need the rocks for? Besides, the bins will be too heavy once they're full.

well its kelly slocums bin deisgn that i got off this page.. there for drainage..im not concerned with the weight.. how are your bins?

Welcome Travis. I used Kelly's bin design at first. She has great info on vermicomposting. I have changed to using a plastic 18 qt tub (like for doing dishes) and no holes in the bottom. You could use any small container to start. I do put cardboard (wet) on the bottom and sides, with the bedding on top - the bedding is shredded cardboard and newspaper with a handful of dirt. This has worked well for 4 years now. Very simple to maintain and to harvest the vermicompost. Keep the bedding moist and pocket feed the worms. Freeze the food for 3 days prior to feeding if you're keeping it in the garage, to eliminate fruit flies and other critters. Hope this helps.
Kath

I never drill holes in my 30 gallon indoor plastic worm tubs. Something I have learned is, for anything under 30 gallons, it is more difficult to maintain the desired conditions. It's sort of like aquariums...it's much easier to maintain a 30 gallon aquarium than a 10 gallon aquarium, if properly set up.