Actuellement, j'explore les merveilles de la ...

Hi Buddy my french is very poor so I hope you can understand English. Mixing nutrient brands is very advisable in my opinion as each nutrient provider has their feed tables. The plant will havbe stopped stretching now it will not grow any taller, unfortunately. Personally, I wouldn't give her too much at this stage you could cause an overfeed and stunt your plant by weeks. Depending on what kind of plant this is if its an auto that's typical for an auto they tend to flower sooner and are smaller when compared to a photo and if it is a photo then you didnt veg her for a long enough time to build a sufficient amount of side branching and tops to support a big harvest. However, don't let it deter you. We all make mistakes it is part of building a genuine growing experience. Shes looking very healthy. Best of luck buddy.