When the Florida Philharmonic filed for Chapter 11 bankruptcy last month, most of its board members, musicians, and managers threw up their hands, passed the buck to each other, and mourned the demise of the region’s only large orchestra. But two members of the Philharmonic’s chorus are refusing to let the Florida Phil slip away, and have raised $900,000 in an effort to get the organization back into workable fiscal shape. Support for the effort has been slow to come from musicians worried about their contracts, but the choruspeople now seem to have the organization behind them, and hope to raise $2 million by this Friday.