Deficiencia?

Thanks GrowCN, I didn't know that, I was just following the instructions from the grow shop, they told me to keep applying them throughout my Grow, but it's good to know that it's unnecessary!

"I have been applying trichodermas and mycorrhizae since the first week..." It sounds like you are applying regularly during the grow. It is more like starting a fire with a match. Once a fire it lit you don't need to keep throwing more matches on the fire. Once you put mycorrhizae out there it will grow and reproduce as the roots grow so you only need to apply once. I treat the seed area when I first plant.

I've been applying trichoderma and mycorrhizae since the first week, is this Septoria condition still possible? I've had humidity issues a few times, but I keep the tent ventilated 24/7 and I've never reached humidity levels above 70%.

To me it looks like some type of Septoria, a fungal disease caused by too much humidity, but without a diary or much more information, this question is difficult to answer more specifically. Once this leaf "blight" gets going, it is very hard to control. Let google guide you. Hope this helps, Organoman.