OGgrowsanswered grow question 5 years ago plants of that size don't need calmag and if you have a good substrate they don't even need any growth fertilizer, just root stimulator. looking at the substrate, see if it has practically no perlite or vermiculite, it could be PH, but due to the age of your plants, I donât think so, I think youâre giving a lot of water in each irrigation, the substrate is very wet, the roots donât breathe and they do not develop soon the plant also stops developing and goes into stress. let the soil dry well, try to add some pearlite to your soil and give small amounts of water for each irrigation. good luck mate đ