I’m in the process of upgrading my aquarium to a 150l tank, and am starting from scratch with the base. I have Marina black gravel, and ahead of laying it, I’m wondering whether I should put some form of soil / substrate which has nutrients below the gravel in locations where I’m putting plants. Is this recommended, as I want to give the plants the best chance of staying healthy, and I know gravel doesn’t contain any nutrients. Thank you! Thank you!