It's too late for your precious succulent to be saved if the leaves are mushy. You may notice yellowing in your succulents if they have been kept in the same container for too long without being repotted or added nutrients. Cotyledon can be watered in the same way as other succulent species. There are many brands, but all of them do the same thing. Although the specific plants included in each pack cannot be identified, packs can be a great way to quickly build up a collection. Is your succulent looking a little tired despite all the attention you give them?