Cann have you considered using biochar in your soil mix?
It will improve the drainage, become a home for microbial life, retain nutrients, improve the water holding capacity and help with your ammonium smell by mopping up any excess nitrogen and other potential nasties.
See the Terra Preta thread link in my sig for more info.
It will improve the drainage, become a home for microbial life, retain nutrients, improve the water holding capacity and help with your ammonium smell by mopping up any excess nitrogen and other potential nasties.
See the Terra Preta thread link in my sig for more info.