If you want to have a planted fish tank, it is important to have the right substrate. Many plants need the nutrition that the substrate has to offer. Of course, there are many different options to choose from.
When you are choosing your substrate, think about the price. It can get expensive if your tank is large so look for an affordable option but don’t go with cheap substitutes.
The size will be important as well. If it is too small, it will get compacted and cause problems. The reactivity to water should be considered as well.
Of course, the way it looks is going to be important. Choose a substrate that will really make the plants look good so the entire tank has a nice look in your home.