all octopuses squirt ink. if they feel threatened and have a need to flee they will ink ,turn pale and jet away. how do i react? i find it facinating- you could call it love or elation..its amazing behavior. they can store quite a bit of ink in that gland and can release it multiple times in succession.i've even collected some of it when they inked on me outside of the tanks and used it 'as ink' to write with. by the way it can stain your clothes but lemon juice is pretty good at getting it out (of your clothes.) but i digress. i dont worry about it at all in the aquarium. if you have adequate filtration and water movement/circulation in your tank to truly care for an octo dont fret. its not particlarily toxic to them. just enjoy it.or try not to piss it off, or frighten it- then you'll never see that incredible sight. sure, dwarfs ink. they wouldnt be a self-respecting octo if they didn't. by the way with as many as 100 bimacs ive seen a lot of ink. and when anybody comes over to check them out youve got to demonstrate that ! zy