I received a corm last month from AquariumPlants.com. I set it on the substrate in 75-80 deg. water, with light 9 hours a day. I waited for signs of Life so I could plant it in the soil in a good position. By the second day - what looked like the bud-scales fell off and revealed a corky scar. It's sat there for 3 weeks with no sprouts or roots at all. How long does it take for one of these to come out of dormancy? Is it a Dud?