What deficiency could this be? Week 5 of veg. Using fox farm ocean Forrest. Wondering if my soil is running out of nutes? Used cal mag.

Sorry for the late response. I didn't see a notification. Topdressing is adding dry ammendment nutrients to the top of your pot. This is a living soil technique that allows ammendments to break down naturally in the soil to feed your plants. It is similar to the process of leaves and sticks falling in the Forrest and creating a nutrient dense/fungus rich food source for plants. If you are using bottles for flower then the procedure will be different. Yes, your new soil should be enough for all veg growth. You will need a flowering fertilizer to get the most from your plant once you change the light schedule.

Nice! Ok I just transplanted into 3 gallon pots and I’m still giving them cal mag and fish shit. I will test my run off my next water and see if my ppm is good or if I need nutes. I have fox farm trio on hand for when it’s time to add nutes. Thanks Cam you always come through

Happy to help. Make sure you observe the feeding schedule on the bottles and what to add when. No need to test runoff in amended soil. You will flush out nutrients if you do. If you just transplanted they will return to normal within a week. Happy to help!