(April 8, 2020, 10:38 AM EDT) -- HOUSTON — An executive with a hydraulic fracturing sand company on March 29 filed a first-day declaration in Texas federal bankruptcy court stating that a reduction in demand for fracked oil and gas reduced the company’s revenues from $530 million to $34 million (In re CARBO Ceramics Inc., No. 20-31973, S.D. Texas Bkcy.)....