Calcio e magnesio?

Calcium (Ca) toxicity from the looks of it! - small wilt on bottom foliage, stunned growth, and numerous other deficiencies caused due to this toxicity (Potassium, Magnesium, Iron, and Manganese). Reduce the Calcium additive dosage to about 0.2-0.5ml/l, don't forget that it is a micro-nutrient which is needed in small amounts in the medium. Using additives when no appropriate deficiencies are showing will most likely cause toxicities like this, plus your "Bat guano Powder" contains more than enough Calcium for your plant so you may want to consider not using the Calcium additive unless a deficiency sign shows. Hope this helps! Good luck and happy growing :)