The brown pebble sized things. I pulled some out and they are hard as a rock. If anybody has a clue help me out.
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Thanks for the suggestion. I will try that. This is a used tank with the existing sand bed so it could be anything.Looks like larger sand particles. Try removing them and examining under magnification
I have mixed size as well. It creates an uneven pattern.Thanks for the suggestion. I will try that. This is a used tank with the existing sand bed so it could be anything.