Brown leaf tips can be trimmed with scissors. Trim so you keep the same leaf shape. Plants naturally transfer nitrogen from older leaves to new ones. That is why the older leaves become yellow. When a leaf becomes more than half brown or yellow, it is time to remove it.
You might want to consider replacing higher-light requiring plants with those needing less light. Check an indoor plant book that gives light requirements or search on line for “low-light house plants.” Indoor plants that tolerate the lowest light conditions include Chinese evergreen, cast iron plant, peace lily and snake plant. Also low-light tolerant are dieffenbachia, dracaena, parlor palm and devil’s ivy.