Low light plants...which substrate to use.
I would like everyones' opinions on what substrate I should use for low light plants. The species will be limited: anubias, crypts, ferns, and some stem plants. Obviously, I would not bury the rhizomes of the anubias or the fern, but their roots would be in the substrate. Is a nutrient rich substrate that important for these kinds of plants?
Right now I have basic aquarium gravel and some sand mixed together. If need be, I could always add fert tabs below for the root feeders like the crypts if I keep the gravel. If it is important to get different substrate, I am looking at a pretty penny considering I have a 150 gallon.
Note: I have had success with the anubias with only gravel, but I have had phenomenal success with eco-complete in my other tank. I just want to know if it would be necessary to buy that for low light plants.