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			 I've used vitamin c if that's what your referring to for a long time , I don't anymore and theres no real noticeable difference that I can see. 
		
	
		
		
		
		
			If you need help with growth or colors maybe a little about your system and what your trying to achieve will help ![]() Some zoanthids won't eat foods , well Not the ones you'll offer anyways as they are too large , some larger species like zoanthus gigantus or palythoas species will take meaty foods like mysis. Besides photosynthesis , what they need is found in the water column , adding food won't hurt though as long as you keep the exporting of nutrients at bay with the importing of foods.remember the build up of too much foods is often a slow process that doesn't get noticed til agae takes hold which is way to late. 
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