Here is a picture of my brassicas (cauliflower, brussel sprouts, cabbage, and broccoli) growing in the soil cube mixture.  I followed the recipe of the soil cube instructions to make up my mix.

The seedlings are a bit spindly.  I will move my light source closer down toward the seedlings today and observe as to whether that improves their spindliness.

I also need to buy another grow bulb as I only have one installed in my grow tub right now.