looks like trace elements? boton deficiency would result in necrotic spots forming interveinally. but ... rapacap is right.. don't do aything crazy.
for future reference....
trace elements are rarely the actual issue, so i'd lean toward pH issue or possibly over-feeding and locking it out. got some burnt tips too... if using some 'bloom booster' these often suggest a much too high P or K levels.
the soil should have plenty of trace elements... if you go hydro, a good hydro nute mix should have plenty of trace elements without worrying. if either of these things prove to be untrue, it is time to switch products.