The beer was officially flowing at Cycle Brewing, downtown St. Petersburg's newest brewery, on Thursday evening. The operation is still pretty bare bones — the taps were labeled only with painter's tape, and there was a bucket in lieu of a tray beneath them to catch beer drippings — but the brewery is open to customers. On a black wall next to the bar, six craft beer options were listed in chalk, from a Ryerish Red Irish ale to a couple single-hop brews. All of them were $5. Be warned that Thursday it was cash only, at least for now. Word spread about the opening after Cycle Brewing posted a note on its Facebook page Thursday afternoon urging people to come grab a beer that evening starting at 5. One of the bartenders said they'd be open as long as there was a crowd, and plan to open late afternoon on most days.Before taking over the spot at 534 Central Ave., Cycle Brewing was based out of the Mexican restaurant Peg's Cantina in Gulfport. There will be a grand opening sometime in September.