Easy Bud RQD

Hallo, für mich sieht es ebenfalls nach einem beginnenden Kalziummangel aus. Aber wie mein Vorredner schon sagte, Anfangsstadium wenn, noch schwer auszumachen.

Guano is very strong (extremely high phosphorous) and giving it to such a small plant may be the cauase, especially if you splashed some on the leaves. I would not be too worried, it will not effect anything, but I would avoid using guano at anything more than one fifth strength and no more often than every 3 weeks on a plant that size. Anyway, it is not a fungal problem. If you are a new grower, I suggest you visit the "Mandala Seeds" website and read their "grow guides", it has a huge amount of excellent information with a good focus on European products (and North American too)....you will find the grow guides most interesting!

It doesn't look like fungus or defect to me. Maybe pH or nutrient imbalance. I wouldn't do anything just yet.