Okay, I got SeaChem flourite as a substrate (rinsed it for like, forever before placing in tank). I planted a variety of swords and ferns. I have daylight bulbs in the hood. Plants are dying. I don't know what else to do. I visited my local pet store and it had this phenomenal planted aquarium - everything looked lush and vibrant. And then I noticed a plastic soda bottle with an airline tube coming from it and going into the tank and bubbles coming out of it. I asked about it and finally I found someone who said that yeast and carbon dioxide and plants will thrive. I tried to find out more but it was a delivery day and all the workers were scrambling to stock the shelves. So, has anybody heard of this? Can you help me do this in my planted aquarium? What can I do? What do I need? Thank you!