leaf problems

my leaf tips have come to dead points that are almost pointed like needles. Also the veins of the leaves appear to be much darker then the leaf itself, but it seems this is because the color of the "meat" of the leaf is lighter then it should. From what i look at it seems like that is a zinc problem? Can anyone veify or deny. Also if it is a zinc deficency how do you fix something like that. Im mostly concerned about the tips of my leaves though, it effects more then 1 of the plants.