WillC said:If the leaf stems are drooping even after the soil has been watered well, then it is just the weight of the leaves that are causing the drooping and it is not a concern. However, more light will help develop stronger leaves in the future.
If the leaf stems do perk up some after watering, then you are waiting for a bit too long to provide water. It is best to water just before it reaches the wilting point. I'm not sure what you mean by "half dry." However, I suggest that you water from the top as soon as the surface of the soil feels dry. Add enough water until a bit runs through the drain holes. Fatsias prefer cool, moist conditions and very bright indirect indoor sun.
plantladylin said:I pretty much agree with WillC's assessment but I am a bit confused. when you say "We water when it's half dry by leaving in a tray of water for a few hours."
Does that mean you do not pour water onto the soil at the base of the plant but only pour water into a bottom tray? If that's the case, I think there might be an issue with the soil not taking up water to the plants roots properly. I'd water from the top of the soil until the water exits the drain holes in the container.