Two years ago all of the succulents (around 10-15) I bought rotted within the first 4 months (with most of them gone after first month and a half) and the reason behind that is because I didn't know better than to leave them in the soil in which I bought them. Around 70% of succulents I ever bought were in soil that was 80%-90% compost + 10%-20% fine sand (and all store bought succulent potting mixes I ever bought were like that), which in my opinion is the worst soil in which you could put succulent in. And other 30% of succulents came in soil that consisted of 50%-80% bark and the rest was compost, which is better but still too organic for the humidity levels in my home. Because of my love for succulents and cacti I decided to try again this year after learning from my mistakes and this time potting them in mostly anorganic soil as I mentioned (50% prelite, 25%regular potting mix and 25% rough coir). Only month has passed since I bought first few of the succulents I have today so I can't say much of how affective that mix is for me, but for now all of them (around 40 (of which most are still babies)) are healthy and no one shows any signs of too much moisture or root rot. But as I said, only month has passed, so wish me luck. 
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