I started a walstad method 40g breeder tank this past friday. I used MCOP and black diamond for my cap. The main question I have is when do you add your fish? I know some add fish right away, but I was warned with MCOP I will have a ammonia swing as the soil decomposes. Should I wait until after the swing...and also is it better to do water changes during that period or to let the tank stable itself?