Barclaya longifolia does not need especially high temperature, neither to grow or flower. 22 degrees celcius will do fine!! The flower is really something to behold..... like taken out of "Jurassic World".....
Personally I would not call the roots "sensitive" in any way. They may start a bit tiny, but will grow quite strong and big. A nutrition capsule right under the bulb will speed up growth rate considerably.
Light needs to be "reasonable", meaning that the leaves will not develop well in very low light. Colouration (more or less red-ish in different plants) will be light dependant, too. Barclaya longifolia will happily tolerate quite high amounts of light.
Usually a healthy growing plant will produce small plant-lets around it. Be carefull to not separate these from their tiny bulbs, if you remove and re-plant.
Be aware, that Barclaya longofolia is an all time favourite food, for almost all kinds of aquatic snails!!!!!