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Anything Bad in Food Coloring????


ciao

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Does anybody know if there is anything toxic in food coloring that could be harmful in reef systems??? I have a leak somewhere in my sump tank that I need to track down and thought adding a little food coloring in the water(after it's been pulled out of the system of course) to see where the leak is originating from. I would of course empty it out again but wanted to make sure that any residue wouldn't harm the system.

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