These non-green cactus are known as Hibotan.
The red ones are also known as Ruby Ball Cactus or Red Cap Cactus.
The yellow ones are sometimes named Moon Cactus.
Moon Cactus are as beautiful as any flowers.
Although they last a whole lot longer than flowers do, nevertheless they do not last perpetually.
Everything has a lifespan.
Moon Cactus has a lifespan of several months up to several years.
Tips for Keeping Moon Cactus Happy
Place it where it receives bright but indirect sunlight.
This is because the
Water only when the soil is completely dry.
Never permit the cactus pot to stand in water.
Ideally, use a clay pot as it dries up easily after watering, avoiding root rot.
Apply high phosphorus fertilizer only once in a few months.
Cacti has relatively low nutrient requirements.
May you be able to keep your Moon Cactus Happy & Healthy!