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					Originally Posted by kengeroo  my worries is they are a walking grenade.  into a pump/powerhead...  release some sort of toxins on death... tank crash... | 
	
 As far as I know the only chemical berghia use for defence are nematocysts from the aptasia they consume. They store them in their certa (frills in the back) to deter predators. I have had a bunch die in the culture tank with no ill effects. 
Cheers 
VR