I have all my Spider plants in 8" round baskets, all are young plants, unrooted pups in late May 16. They are starting to put out flowering stalks. I have had some problem with leaves that wilt and die off and I'm convinced it is from under watering. They do not like being dry for even a day or two. It may be that these young plants do not have full root development yet, not really sure and I'm not going to dump one out to see.
I'm watering these every 2 or 3 days, south window indoors, 66-72*F and 50%+/- humidity. I'm going by the weight of the gasket to determine if they need h2o.
This kind of goes against what I have read about these plants. Mine are not happy when dry, they like to be moist all the time.