I’m wanting to add more substrate to my aquarium in the hopes that it will help my plants to grow and thrive. They were doing great and then they weren’t. I’m going remove the plants that are continuing to fail, and I’m going to add 2 new ones. I’m going to change the filter also because it’s been a little while since I’ve changed it. Any suggestions about this? They get about 8 hours of light and there’s a skylight above the aquarium also.