Although they will eat every part of their prey, some remains may be left in the tank or even buried by the lobster. Although, all crustaceans can tolerate higher levels of ammonia and nitrites than fish, the uneaten remains can still use up valuable oxygen in the water. With the very largest of lobsters the aquarist may not be to blame if the lobster dies as it may not have obtained nutrition in the wild to satisfy its huge bulk. There does not seem to be a maximum size that a lobster can attain and the biggest lobster will be one that can survive all the considerable hazards in the sea. Others seem to have a variety of claws that are not easily identified as crushing or cutting, but between the two.
Colours vary from almost black to a very light shade of blue with some being pink.