Culture of Tacitus bellus is fairly straightforward, it needs more shade than others in the family however it can tolerate full sun (where it stay compact) but a much better exposure is shade to light shade. 
Although it needs a soil that is gritty and porous with good drainage, the soil must be able to hold the moisture that the plant requires. The ideal soil should contain equal parts of loam with small gravel added (eg pumice or lava grit). Good drainage is essential. 
Water when plant is dry and do not water again until the soil is completely dry again. Fertilizer should be applied only once during the growing season, diluted to ¼ the recommended rate on the label. 
During October to March, water very sparingly, using only enough water to keep the foliage from shriveling. It can overwinters well also under grow lights in a cool room of the house. Tacitus bellus requires low temperature for flower formation and it will not flower unless it is overwintered for at least a month at 15° C or less. It is usually recommended to avoid freezing temperatures, but it can withstand temperatures down to below -5° C (or less) for short period if dry. 
Pay particular attention to make sure that they do not rot at the root from soggy soil. In a very humid situation in winter, it can rot even if totally dry. It  likes dry air as much as dry soil.