Hey guys, I'm working on my first planted aquarium. I'm planning to use mineralized soil as my substrate. Despite reading though a number of different threads on the subject, there are still a couple things that I don't quite understand.
The potassium carbonate, I gather, is to supply the plants with needed potassium, however, I cannot figure out what the dolomite is for. In fact I am wondering if it is something that I would prefer to avoid, as it seems (from my limited knowledge) that it could possibly increase the aquarium PH (I passed up some beautiful limestone rocks at the rock yard for this very reason).
I keep Cardinal Tetras primarily, which prefer acidic water. While I don't make any special efforts to lower the PH, I certainly don't want to introduce anything that could possibly increase it.
Also, regarding the appropriate topsoil. The threads I read suggested just cheap topsoil. That's what I got, but I was under the impression that it wasn't supposed to be so rich in organics.
The stuff I got is called EarthGrow Topsoil and suggests a 50/50 mix with native soil (I assume I'm to ignore that suggestion for my purposes). The bag says that it includes "organics and inorganics from one or more of the following: peat, forest products, compost, ash, sand or native top soil." Does that sound like the right stuff?