Hello to everyone! I currently have 6 Hermit Crabs...all PP's and I would really like to redo my tank. The problem is that I just can't seem to find any suction cups that will work. (including most of the ones that come attached with the household or bathroom shelves you can use for levels, and even a lot of the plastic plants that have suction cups won't stick)They either won't stick at all or they fall shortly after placement (usually with a crab still attached!) I have tried making sure that the tank walls are clean and dry, etc... How do I fix this problem? Is there a certain kind or brand that seems to work without fail? Thanks so much in advance!