to the forum!
A couple of questions, if you don't mind...
How are you deciding when the soil is fully dry?
Do the containers have holes at the bottom?
Two notes about the situation. One is any time 3 plants from the same source pass out around the same time together, maybe question that source. Just saying here that what happened may not actually be related to something you did. Care by the retailer can adversely affect the product you buy, in a fairly invisible way (at first).
And as a general tip, the catastrophic meltdown of succulents in an indoor situation may have to do with other variables beyond (or in addition to) the watering. Light and good air flow are important. Were these plants able to "see" the sun for hours a day (weather permitting), with no curtain or blinds in the way?
