I planted some notocactus seeds sometime in September and many have germinated since then. A few weeks ago, there was an incident where some of my succulents may have experienced frost and I can't be positive which ones (other than the obvious effects: I had to throw many away as a result of succulents drooping and oozing). I haven't noticed any obvious growth in the notocactus seedlings recently and pictures I've taken fail to help me identify growth due to the extremely small seedlings' sizes (see below).

[![Notocactus seedlings](https://i.stack.imgur.com/D0PgL.jpg)](https://i.stack.imgur.com/D0PgL.jpg)

I'm curious as to whether my cactus seedlings have died or not. *They seem mushy when probed with a small toothpick*, which I know is a sign of succulent death. Is there a definitive way to be able to tell whether my notocactus seedlings have died or they're just going through typical slow growth?