White spots everywhere. Leaves paler than they should be. Coco with Canna nutes. Rhizotonic, Cannazym, A + B and Cal Mag Stunted. White never yellow, red or brown. On young leaves, baby plants, fan leaves, old leaves. Some Young leaves start green, get spots later Take a look.
Looks like it may be slight heat stress from the way the edges are curling up. What your temp/humidity? How much nutes?