Simplify the following text for a Grade 7 native English-speaking person.
Original: Yellow or brown leaf edges may be caused by too much direct light , crowded roots , or fluoridated or chlorinated water , the latter of which can be prevented by leaving tap water exposed to the air for a day before plant use .
Simplified: Yellow or brown leaf edges may be caused by too much direct light , crowded roots , or fluoridated or chlorinated water . The problem with water can be prevented by leaving tap water exposed to the air for a day before plant use .