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tenda > any brand will do..most common brands in the market today are LUXFER and CATALINA cylinders available at AQUAVENTURE WHITETIP, ASIADIVERS, and AQUAMUNDO..if ganahan ka 2nd hand tanks, u can drop by at SCUBAWORLD capitol at the back of CDU or visit their diveshop at Punta Enganio, Lapu-lapu City just beside Hilton Hotel..Be sure to pick the most recent "HYDROSTATICALLY TESTED" youd see recent marks on the tanks neck..One more thing, it is not that practical to purchase your own tank or cylinder not unless you will be diving more frequently on REMOTE dive sites other than the city area..Buying 1 will ADD up to your burden of carrying your gears everytime u wish to dive..Hope that helps..
