I have setup a planted aquarium, but because I didn't know it in the beginning I didn't use special nuritious substrate for my aquarium. As you can see the aquarium from the picture, I have guppies and other ones like snails. I used hagen gravel for my tank while setting the tank. But now I understand that for planted aquarium I should have put nutritious substrate for plant growth in the basis. Now it is very difficult for me to take everything out and do from scratch. So if I put beneficial substrate for plants on top of the gravel which is just inside the aquarium? Would it still be beneficial for plants? For instance If I put eco-complete on top of the hagen gravel I am now using would it be OK for planted aquarium? Or is it necessary to take out hagen gravel and put other substrate and on top of it again I should put the former gravel? And which substrate or gravel do you advise for planted aquarium? Or How should I make the soil for planted aquarium?