Can I add new coffee?
After you mixed the coffee grounds and the mushroom spawn, the mycelium [root system of the mushroom] starts growing. Slowly it works itself through the coffee grounds. On the picture above you can see how the coffee should look after about three days.
The mycelium forms thin white threads throught the coffee grounds. In this example we also added the filter. They exist of paper [woodfibers] and that is something the oyster mushroom loves.
This is not yet the moment to add new coffee grounds. The threads are to thin and the coffee grounds are not white enough.