HCA: Hermit Crab Association

I picked up pools like yours and have had them in my crabitate for over a month and my crabs never go near them can you describe your ladders to me.

I was so excited I found the pools at Walmart but now I see they are bigger than yours:( I only have a 70 gallon tank band I think they will be to big. Darn! I need to keep looking I live in Canada also.