I have several indoor potted Snake's plants. One pot has several kinds of plants in it, and is reasonably large - probably 16" diameter. It is filled with Prayer plants, another plant (the name leaves me at the moment), and two varieties of snakes tongue. One of them is like this, and the other one looks more like this (minus the dwarf part). I have had trouble knowing how to water the pot. The later Snake plant mentioned loses leaves when they become soft and bend over. I lost about 18" of one leaf to that, and it looks like I'm about to lose 4" of another leaf due to that. The first variety mentioned doesn't seem to have that problem.
I don't remember when I fertilized it last, but it's been awhile. The Prayer plant and the other plant variety don't seem to mind less water, they just don't grow as fast, and may drop a few leaves - usually nothing major. I usually let the soil get reasonably dry before watering it. The pot is a clay pot if it matters, and it is on the south side of a window facing east, so it gets plenty of light, it's just not direct through the window.
Am I over or under watering, or is there something else I am missing?