PEMBERIAN PROBIOTIK DENGAN PERIODE BERBEDA TERHADAP PENURUNAN BAHAN ORGANIK, AMONIAK DAN NITRIT PEMELIHARAAN UDANG VANAME (Litopenaeus vannamei) DI BAK TERPAL = ADDITION PROBIOTICWITH DIFFERENT PERIODS ON DECREASE ORGANIC MATTER, AMMONIA AND NITRITE MAINTENANCE WHITE SHRIMP (Litopenaeus vannamei) AT TARPAULIN POND - ARUM DANAR PAMUKTI, 141511133142 (2019)