I use the whole substrate system, power sand, additives, etc. I supplied like half a bottle of each and six spoons of the Penac powders.
I have never had fish in this particular three monthh old tank, only healthy plants.
Still, there is a white nematode infestation. Every time I dose excel, Nematodes come out and swim around. They are living in the substrate.
Other than this, everything is fine. I don't know what is wrong withy substrate system to allow the Nematodes to exist there. Someone is off. I don't know what they are eating either since I have never added any fish or shrimp or food to the tank.
Maybe you have some ideas, Frank? What's up with my substrate system?