I just purchased 2 colocasia gigantea plants. I have a few general questions. I will be planting them in huge containers. 1. What kind of soil should I use? Organic, potting mix, potting mix with fertilizer already built in, etc?? 2. What soil addivitives should I use? peat moss, perlite, etc?? 3. Should I fertilize with a Miracle Grow type fertilizer? 4. What else do they need for survival? I live in Zone 5b so they will be coming indoors before the temps hit 45 degrees. Any info to guarentee success will be greatly appreciated. Thank you in advance!!!