Cactus & Succulents
For indoor cactus & succulents, recommended pot size is 10inch, it may do well in 6 inch pot as well.
Typically an indoor cactus & succulents does not change greatly in size, and you want to avoid excess soil in the pot, which can hold too much water and rot the cactus.
Use a potting soil mix with a little sand; a cactus & suculents likes good drainage. You can mix in a little slow release organic fertilizer, but it is not necessary.
Make sure to pack down the soil around the transplanted plant, and thoroughly water it, to help spur the rooting process in the new soil.
When the soil is dry it is time to water. If the plant gets too fleshy and starts to lean over, you need to water less often.
Dry climate, outdoors: Water every two to three days when warm and sunny.
Humid, cool or indoors: Water every week.
During the fall and winter months, the plants should be watered less frequently in order to promote blooming.
Place the plant in a bright area of the home; a south or southeast facing window works great. If natural light is not adequate, you can supplement with a nice natural white florescent bulb. You can put it outside in summer and spring, with indirect light, but it will need to remain indoors during fall and winter.