pH is really important.... You need to get yourself a digital pH pen....$40 for an inexpensive one....and some pH up & down, about $20 for both.... Correct your pH and then let us know how they look.... Also, when in doubt, flush it out.... As long as you don't have auto release nutrients in your soil, you should be able to flush out built up salts/nutrients with a couple flushes.... Use 2 - 3 time the amount of water your soil container holds to flush with.... Let soil almost dry before watering or flushing again....

Start with pH....

CGI::::::