Rule of thumb is brown tips, not enough water, yellow leaves too much water or not enough light. I have learned the best way to water is in my kitchen sink. I fill it almost full with tepid water than add some liquid plant food, insert the plants as many as I can fit as possible and let set for an hour. Then I drain them in my dish drainer and return them to their proper spot. I also read that with spider plants you must feed them every time you water. When you just water from the top till it comes out the bottom it is not truely getting all the dirt moist, where as soaking them for an hour they really drink up the water. Always cut away dead or yellow leaves to keep it healthy. I have gotten many new spider plants from the shoots that I root in water and then plant. Good luck and I hope this helps.
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