Sandbed Seeding

[PFisher]

I have just added a sand bed to my tank, and now I need to seed it. Due to a flatworm problem most of my live rock has been FW dipped, so not much life in there. I was hoping to buy a few pounds from a LFS, but they all have flatworms and that was not what I was hoping to seed my sandbed with.

Does anyone have any suggestions of other flatworm free sources of LS. Ordering online for a few pounds of LS is just not economical.