Background plants are generally the largest plants in the aquarium, and are situated at the back and in corners to create a beautiful backdrop to your tank. They can also help to hide unsightly equipment and provide some necessary hiding space for fish. Background plants also play a big role in the depth of your tank and will influence other plants in the tank and where they are planted. Be mindful of their “shadow over the rest of your plants. But remember this van be a positive for low light plants.