I have marco and have the same issue. In addition, every time i repsitiona power head sandbed shifts and I have a wise a** maroon clown who loves to wag his tail in it that clouds the tank daily. My rocks are constantly covered in silt. It's been 2 years and I am planning a makeover soon. Trying to decide whether to go with a larger particle sand or crushed coral.
That said, Marco is a great guy to do business with. His sand looks and feels awsome to the touch but it just never settled in the way I hoped.
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