I have a fluval 800 with a pleco, 7 neons, 2 guppies, 2 mollies, 9 danios and 4 other tetras. I have had my tank for about 8 months and have never been able to keep my plants alive. The temperature is always steady along with the pH. I have gravel not sand. Someone suggested to me a while ago to change to sand but its too much hassle, anyone have any suggestions?