This form includes verbal or speech developmental apraxia, perhaps the most common form of the disorder. Constructional apraxia affects the person's ability to draw or copy simple diagrams or to construct simple figures. Oculomotor apraxia is a condition in which patients find it difficult to move their eyes.
Medium ones about the size of a golf ball may molt every four to six months and stay buried for about one to three months. The smaller hermit crabs may molt as often every month or even every few weeks for the tiniest ones, and may stay buried to do it for only a couple of weeks or months.
The most attractive member of this group is the blue-legged hermit crab (Clibanarius tricolor). This species grows to less than an inch in length. The blue-eyed spotted hermit crab (Clibanarius digueti) is an even smaller species that will scavenge on uneaten food, eat algae and is too small to be much of a threat to your fish. Not only are hermit crabs potentially dangerous to fishes, they will also eat tube worms and ailing corals.