The problem with that would be all the organic matter in the foods decaying. It would wreak havoc on your tank. Mineral soil (yard dirt) will more-often-than-not have enough nutrients to last you for a long while with the possible exception of potassium. There is an article on mineralized topsoil in the library (look up at the gold menu-bar on the top of the page). If you use soil from your yard/garden you don't need to go through all the wetting/drying steps, but then you must be VERY careful about whether or not you are introducing pesticides or other chemicals into your tank.I was wondering other than getting those ferts at a lfs, are there anyother way of getting those nutrients? I know the dosing schedule.
I.E. I think baked potatoe and raisin contains potassium can I grind those up to provide plants with potassium?
Dear Qwertus,I'm wondering for those who have low tech tanks, how do you provide the plants with nutrients like potassium, magnesium, iron etc...
I'd be the last person to pretend to understand the subtle relationships which occur between GH, KH, ph, etc., but I'm thinking 75 ppm is probably too low. I do know that our tap water is very soft and if I don't occasionally add some Calcium, Magnesium, and Potassium salts, I also get holes in the plant leaves, very slow growth, and some plants like Valisneria just dissolve. These are nutrients plants absolutely need, and they prefer to take them directly from the water. The rest like iron come from the soil.I checked GH earlier and it says 75 is that really soft or is it ok? some plants have some decaying spots on leaves thats why i'm trying to add some more nutrients in. I think its potassium thats lacking.
my aquarium chemistry handbook states thatI think that if your GH is 75ppm, then you have about 4.5 German degrees of hardness. Maybe someone can confirm this, the divisor is about 17 for Ca and Mg?
I never could find a fixed definition of what is "Hardwater" and what is "Softwater".The 20g-long has a GH of 100ppm, KH of 90ppm and a PH of 7.4.
The kit says the GH is moderately hard, but Diana's book says that is soft.
Either I need to add more eggshell or go straight to a K, Mg dosing.
It sounds like your tanks are doing fine and you're doing the right things.Thanks for the info.
Another question, would brine shrimp add some of the other minerals like K and Mg.