Yea I would definitly fill another pot also til you can see where its supposed to be at. if the top of the soil is starting to dry out i would add alittle water. I generally put my finger about a inch into the soil (in bigger pots) and see if I can feel moisture on my finger, if I can I leave it. if not I add water. You can tell also by if the leaves look all puffed out and kind of swelled between the veins like little pillows lol then you are overwatering, if the leaves dont seem to be "reaching for the light" and kind of drooping alittle bit then I add water, and I dont mean wait til they droop over and are all rubbery i mean when they just start to go down alittle but are still firm.