Is there a size at which a crab won't climb the silicon siding of a glass aquarium anymore? I am wondering about mine. Also, I am unsure but at this point a little worried that the ones in my 10g might have the faintest possibility of lifting the lid. Is this possible? Should I stick a dictionary on top to weigh down the lid? pics of their sizes are the first two pics of crabs on my link sig, labeled "one of the new guys" and "the one that won't come out when held". And the third one i don't have a pic of but he/she is smaller than the other two. I'm not really worried about the 55g because that lid is kind of heavy and the crabs in there are the same size as the ones in the 10g. But liek i said the lid of the 10g isn't as heavy, so can they lift it? Or is it that after a certain size tehy won't climb the silicon anymore? Thanks and sorry for long post!