I don't know what a hot soil mix is, but I am using subcools super soil recipe with a few more ingredients, nothing really special but it seems to work very well. I do have two exterior filters on the tank and a well seasoned biological bed circulated with two (225 gph each) power heads pulling through the undergravel filters. I don't clean the gravel more than a couple times a year & the fish/aquarium plants & MJ plants flourish. When watering I use around 15 gallons weekly (currently, more later in flower) and the water changes seems to keep things balanced nicely.could you elaborate on your setup, you are using a hot organic soil mix correct, and do you have a filter in your aquarium, are perhaps lazy and never clean it, and or the rocks creating a natural bio filter without you knowing it?
possible? I have A pond and a river both have good water but nethier is anything close to a strong enough solution for hydroponics.
So that's what I have going - and it seems to work for me.
GWN