Seaweed culture become an important activity in Indonesia because it has good economic value and continues to increase from year to year. Several factors that encourage this development include large market potential, government support in developing seaweed culture, and farmers awareness for environmental sustainability. One genus of seaweed that has the potential to be developed is sea grapes (Caulerpa.spp). Apart from domestic purposes, marketing opportunities for sea grapes are also wide open for various international destinations, including Japan, China, Korea and Malaysia. In the future, it is estimated that the market potential is large and tends to increase and will not be met by the supply of fishermen who harvest it from nature (the sea). Some people have tried culture sea grapes, but so far the results have been less than satisfactory. This research was carried out to respond to these challenges, namely through culture studies in semi-indoor hatcheries, which focused on experiments involving different rearing media and planting containers (spot collectors). The aim of this activity is to obtain the best cultivation technology so that it can increase optimal production performance. During the test, the productivity of each treatment is measured, including absolute growth rate and specific growth, and at the end of the test, the level of business feasibility is measured. The results showed that controlled tanks with different spot collectors produced an average daily growth of 16.34% with a multiple of production compared to planting weight of 4.37 times on average. This technical data is converted into economic value and produces information that culture sea grapes in controlled tanks using the spot collector method is profitable, so that it can be developed to support government programs related to the Green Gold movement in the maritime and marine and fisheries sectors.