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The midget octopus never gets much bigger than a manderin! Hence the midget title (bites though!). And yep Carol we just call him Midget .
Plasma measures about 1.5 metres across his arms and his mantle is about the size of a rugby ball!
We actually have another Plasma (smaller about 50cm arm spread)!!!!!!!! But he keeps escaping, he's taken up residence in a neighbouring tank behind all the rock work :x and short of dismantling the tank we can't get him out. we'll have to wait til he gets too big for his hole (and yes we've tried enticing him with a juicy crab.......no go!)