After Monday's over 300 point rally, the Sensex at the Bombay Stock Exchange opened 90 points, or 0.5 per cent lower, at 17,786, on Tuesday, on profit-booking by investors, and amid weak Asian markets. Remaining subdued, the Sensex stood 61 points, or 0.3 percent in the red, at 17,816, a short while ago. Other Asian bourses in Japan, South Korea, Singapore, Indonesia, Hong Kong and Taiwan fell between 0.2 percent and 1.2 percent, on renewed concern over Europe's economic crisis, after Fitch Ratings cut its debt rating on French bank, BNP Paribas.