Octopus huttoni,

[livingart]

https://www.youtube.com/watch?v=2pGD3Wukb9A

Thought i had lost this little fella a few times now as he is in a large system, have had him 3 months and hasn't grown much. 

Octopus huttoni, 
Octopus (Smaller)
OCTOPUS HUTTONI INVERTEBRATE
The smaller octopus - octopus huttoni are usually seen about the size of your fist, and tend to be more frequently sighted on night dives as they emerge to feed. They tend to be more fearful compared to other octopus, perhaps realising their size makes them an easy meal for predators. These small octopus make homes out of almost anything, old cans, and bottles that have been discarded, usually found in scallop beds or shells on the ocean floor will often hold octopus.
Up to 57cm in total length.
Seem to be more aggressive than larger species and can bite.