Sabouraud dextrose agar breaking? I recently started growing some Geotrichum Candidum (GC) on Sabouraud dextrose agar (SDA) beds. The SDA was poured into sterilized petri dishes. After setting the plates in a cooler (20 C) for a day, I then inoculated the plates with a tiny smidge of GC. The GC is growing happily in that environment. However, today on day 3, **I noticed a crack across the SDA** like shown in the picture below. What does this mean? Did I prepare the plate wrong? Or is my GC just a bit naughty and somehow burrowing into the SDA? _Please note I am not a trained biologist, I've learned the skills I require for my activity from online resources and advice._ ![a crack in sabouraud](

I cannot be entirely sure about the cause as I have not been able to reproduce this situation subsequently, but based on the comparison of what I did before and do now, it seems the cause was the wrong dosage of agar per water, i.e. an excess of agar. Hoping this may help others.