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My gravel substrate is usually a tan/white color all around. Recently I noticed a couple spots had turned gray (not all at once, I would clean one spot and 2+ weeks later notice a different location with the same gray underneath). I gravel vacuumed it up and noticed it turned the gravel that gray color (attached pic).
It does turn back to normal after cleaning and sitting on top but curious why this happens or what does it mean? It did have a little smell in the bucket of water I took out.
I do use root tabs but sometimes not in the locations that the gravel turns gray.
It does turn back to normal after cleaning and sitting on top but curious why this happens or what does it mean? It did have a little smell in the bucket of water I took out.
I do use root tabs but sometimes not in the locations that the gravel turns gray.
