I'm done with live plants in my tank. No matter what type I get and how long I keep the light on or what additives I put in, I cannot keep the plants alive! They always seem to die off and even the swords fade away! What am I doing wrong? I dont see how that $25 a bag substrate would help. I guess I can add another light. I'm using a standard one bulb florecent light right now. I know it's not the fish. Any advise would be great...Thanks