A hotel tower on the Las Vegas Strip is expected to reopen later today, after E-coli bacteria was found in the well water used by guests. The "Review-Journal" says earlier this week, water at the Tropicana hotel's Island Tower was shut down after traces of the bacteria were found during a routine test. The Tropicana is the only Strip resort to use well water, which is mixed with municipal water supplies. A hotel spokesman says there have been no reports of illnesses, but nearly 500 guests were moved Monday to other rooms or neighboring resorts. The Southern Nevada Health District is expected to conduct more tests of the water today, before giving the green light to reopen the tower. Hotel officials say they will use municipal water exclusively.