It is difficult to over water a clay pot as the porous clay keeps soil well drained for the most part. But, remember that since they do dry out quicker you might have to water more often. It is very important to water well, always allowing the water to go to the bottom of the pot and run out the drainage hole. This insures that even the bottom roots are watered. Remember that a plant must have fresh air, water and light to grow.
All plants have different requirements, often directly related to their native environment.
Cactus plants don't have he same needs as ferns or orchids. Each is different. Good garden books, the Internet and successful house plant people all are a source of information. So if nothing more, shower the dust from those house bound house plants and give them a few weeks of luxurious humidity out under a tree where the dew and rain can caress them and the light boost their food production. As the days get shorter and the temperatures get cooler, think about bringing them back to a clean window sill.