andrewsk,
I've looked at both WWM, and read what Anthony Calfo wrote before. They are just two opinions. I've read both descenting, and confirming opinions. I said I will consider the sandbed as a possible source, but I'm not yet prepared to remove it without first understanding why I should.
As to answer the natural light question. For the last month there has been 0 natural light getting to the tank. I now keep my blinds closed all day, every day.
Marie,
Thank you for the photos!
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