Stonerdanswered grow question 5y ago The clawing of your foliage may also be caused by water damage, make sure you have proper drainage in all pots and that every plant gets around 20-30% of irrigated solution as runoff.
Also irrigate the plants once the top 5cm of the medium is dry without letting the whole pot go completely dry, this increases the risk of nutrient toxicities/burns and sometimes even cause stunted growth.