It means that in powder form that light degrades it. Store it out of light.
Right - I know lol - I meant what does your post mean : If aquarium light will break it down or not is a subject of debate - I thought that meant you were suggesting that aquarium light WILL degrade it. That was my point. Perhaps I misunderstood. Aquarium light does not degrade it in the water - only in powder form - again it seemed like reading yoru post you were arguing the opposite.



