Brown leaf tips are often a symptom of inadequate humidity. The solution is simple. Place the plant and pot on a humidity tray full of pebbles and water. Don't let the bottom of the pot sit in water, though, as Prayer Plants are prone to root rot. Fertilizing is also a key to success.
Prayer plants like to be fertilized at least once a month from spring through fall.
Use an water-soluble acid fertilizer like Miracid prepared to package directions. Stop fertilizing in September and don't start again until March. That's because these plants rest during the winter. Fertilizer burn can be a problem with Prayer Plants. That's caused by too much chlorine in the water or a build up of fertilizer salts in the soil.