Over watering might be your problem. I actually don't water mine a whole lot. You definately have to have a drainage layer at the bottom. I use leca (the small clay balls) but some people use gravel...same idea. You will also need full spectrum lighting. I use the repti 2.0 but John just mentioned you can get the same quality Bulbs at a hardware store for less. Do a 12 hour photo cycle. Only water enough to keep the soil moist ...not soaking. Again like I said I don't water very often ...just push a finger into the soil...if it feels dry add some water just to moisten it up. Don't flood them. If you're seeing new growth you're doing well. If you have some water in the leca the roots do find their way down there for water. My experience with watering is "less is best" . You can always add water if they're looking dry and they'll perk right up. But if you're flooding them they'll start to look saggy and start loosing leaves which makes you think they need watear so you add more then poof they're dead.