LF: Empty hermit crab shells

[eternitybc]

Our scarlet reefs are outgrowing their shells- 2 of them are quite large, and they keep turning each other over and stealing shells. J&L hasnt had any our last 3 visits, neither did Island fish when we went in.

Anyone have any spares, or know of somewhere else to get some? I found a few people selling on ebay, but I'm not sure what size to look for (I dont want to pull my crabs out of the tank to measure!)