As soon as you name something it becomes somewhat more attached emotionally, having said this all my 'creatures' have names as I enjoy the emotion
...
I keep stomatopods (mantis shrimp) specifically and each of the names of the creatures is a 'symbol' about them in general here are a few examples...
Megatron (G.chiragra): Taken from Transformers, leader of the decepticons...Reasons for this were simple, weight for weight the G.chiragra is the most powerful smasher known and has a very aggressive temperament, it also sports the greys & pinks/purples of Megatron in the cartoon.
Minos (L.colemani): Taken from the mythical creature 'Minotaur' reason for this is rather simple, unlike other species of spearers the eyes on L.colemani are very wide apart and have a pair of 'horns' in between them much like the bullhead of the minotaur, the L.colemani also sports rusty colours of faded red / light browns similar to fur colors.
Leviathan (L.maculata): Taken from the mythical creature directly, reasons for this and the common description for the 'Leviathan' in myth is a large serpent like sea creature, L.maculata is the largest of all stomatopod species and a very intimidating species.
Juggernaut (O.scyllarus): Taken from the villain in the comic 'X-men', reasons for this are simple, like Juggernaut out of 'X-men' the O.scyllarus is a large smashing species and not many things in the aquarium can prevent it from breaking through albeit rock, rubble, filter, heater, glass etc.
Just a few of mine
but ever since naming them all I certainly have grown more attached and I know when 1 passes on it will hit me hard...