Can you post a pic?
I've seen toxic cukes being sold under very cute names.
One rough guide is that bright colors on a cuke are often a warning signal to would-be predators: "I am toxic".
A distinction that may help you in delving further into this issue:
Cuke-puke is the simple puking out of its guts. This can be triggered by stress, or may simply be done as a matter of good housekeeping: a new set of organs is eventually regenerated. The viscera are not necessarily 'toxic', though they will rot if left in the tank.
Cuke nuke is a defense response to stress. The cuke inflates with water, and then blasts it out of its butt
along with toxins from 'Cuvierian tubules': a cloudy spew of death that will kill most fishes and crustaceans, in effect 'nuking' the tank.
Some cukes are more toxic than others, with many drab sand-sifters being nearly harmless.
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Personally, when I see a cuke, I'm immediately thinking of how to prepare and cook it
