The plants look to be in good shape in the picture. Are they okay in person? How are the shrimp doing?
The algae suggests that you have too many organics in the water. Increasing water changes temporarily will remove them and allow the tank to balance out. They don't have to be big water changes, just do smaller ones more often. Instead of once a week, increase it to twice a week. If that doesn't work, you can increase the volume that you are changing.
Rinsing out filter pads and sponges will also help if you don't do this often. Any algae that can be removed manually needs to be. Any dead leaves and or poor plant growth should be removed as leaving such things is contributing to fouling the water.