Spots on leaves

Hope you come across help and if you haven't, yes your deficiency that you're currently seeing on your plant is definitely calcium deficiency but it's still at an early stage so you can definitely go ahead and prevent any future deficiency by just giving it some Cal mag. Also ensure your pH is on point depending on the growing medium.

Drop the Biobizz. I had the same Problem. Evertime someone has this Problem its Biobizz. Its the only thing that helps, never had to struggle with that again after i switched.

It could also be chlorine or chloramine in your water source. They look similar

Calcium deficiency. Feed cal mag and don't stop your grow formula when bloom starts Plant still needs nitrogen for the stretch and then it will beg you for more cal mag at week 4 Calcium is the basis of cell walls Cell walls equal buds

Early cal def

Da fehlt mehr als Calcium: Magnesium,Kalium… Bittersalz und P/K-13/14 sollten wohl helfen.

Cal + Mag def. Petiole leaves and top of stems leaves are turning purplish Magnesium is the central ion in the chlorophylle molecule related to the Nitrogen atoms. This metallic ion is crucial in the photosynthesis process to absorb the blue and red spectrum of the light…. This is why you can see a Mag chlorosis (purple) reflecting from the thinnest walls cells of the plants (petioles and leaves stems). If you are already adding magnesium to your plants, just look at your leaves stems, to diagnose if the purpling starts from the top of the stems that is more exposed to the light, meaning your light is too close or too intense.

Give her cal/mag and she will survive :D

possibly calcium deficiency, but if these are shielded, older leaves, it could be nothing. Calcium will generally show up in upper portion of plant, first. Old leaves that don't get as much light are not as well maintained by the plant. Don't remove. they still perform other functions, like transpiration. CO2 is important. knowing how much Ca you already provide on a consistent basis would help too. Definitely not an infection. If you choose to up your dose of whatever provides calcium, don't go overboard. Ca++ is quick to lockout others. Plus, if you see coinciding interveinal chlorosis, it's more likely a Mg-deficiency. In my experience i see the interveinal chlorosis before the spots with Mg-deficiency, so i'm still leaning Ca.