Well, as expected he's dead. 
 
Great fish and although he'd always been a bit skittish like all grammas, he's been through a few tank moves and the addition/subtraction of numerous other residents no problem.  Hard to imagine anything that would have been stressful enough to give him a heart attack today.  Still very puzzling. 
 
This makes the second goofy gramma death I've had:  the previous gramma met its untimely end when the intake screen on a maxijet got fell off somehow and he went exploring in this new "cave" head first. 
		
	
		
		
		
		
		
	
		
		
	
	
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