von Flan » 1. Okt 2007 20:44
I'm not sure if I understand this question. Cracks are the consequence of placing cotton wool next to the sand( cracks won't tell you how much water should be added…). Add 20 ml and wait. Water will spread. Add another portion.
Try to achieve areas of different humidity(like in my first picture).
Ants are smart, just watch them.