Growing oyster mushrooms for food on coffee grounds. An update.

Starting with an idea to grow fungi/mushrooms on coffee grounds I found on the internet. Using milkcartons as a container to start with, this was one of my first results. A totally with mycelium invested block of coffee grounds.
The first mushrooms I produced were these ones. The start looked promissing, but because of not enough moist it failed.

So I changed the habitat, and placed the block in a bucket with water on the bottom.

One mushroom was born...

But not satisfied with the result I placed the block in a bigger bucket.
And what happened was not realy what I was looking for but another mushroom appeared.

But it didn't even look like one.

Well, this was almost too bad to be true. And I am not the person to give in easily, so another change I made.
Instead of plain water I covered the bottom of the bucket with a Japanese baked clay pieces called Akadama and made it moist.
And than something nice happened.
Instead of one monstrous bulb as mushroom, three came popping out.

And this was the result after three days..

Not bad, I guess.