What's Needed or leave alone?

Your plants looks like they are on week 3 of flower or so. They are already making buds. I would definitely start giving flowering stage nutrients.

blood meal is nutrient. do you did give some. Normally FFOF is a hot soil and can feed for weeks as a time with out needing a top-up. but after 4 weeks it should need something or a transplant. Don't grow under 24hrs of light. its overkill and waste of your money on hydro. 18/6 is all it needs for autos and photos in veg. I do a 16/8 in veg as my DLI is to high at 18/6. Google DLI and read the wiki on it. good information to know. https://en.wikipedia.org/wiki/Daily_light_integral Water till saturated and avoid runoff, wait for dry back and do it again. If feeding amendments apply once a month and mix into top later of soil. If feeding by liquid. apply once every 2 weeks and get a bit of runoff when feeding them. aorund 10% of pots volume. Water in slowley.

Initially, FoxFarm potting soil has an electrical conductivity (EC) range around 0.6-0.8, but as it starts to break down, this can rise to 1.8-2.1 mS/cm depending on many factors, as it's a nutrient-dense and packed with organic matter. Organic matter that which is waiting to be broken down into smaller sizes for uptake. The best thing you can do when you're playing with organics is to grab an EC metre for your soil (not a TDS for run off). Electrical conductivity requires two things, salts and water, so if it's low, you know it's time to water. EC doesn't measure "organic matter" it measures the capacity of salt ions "capable" of uptake by the plant at that time. If you test again after you water, and it's still low, then you know it's safe to add more immediately available salt mineral nutrients. You need to keep tabs to know when it's time to flush that nitrogen out and prevent EC/nitrogen ratio from getting to eventual toxic levels or its going to skew ph, it's not a if but when, by the time that blood meal starts breaking down, it's going to be 2-3rd week in flower(if auto), at a time when the plant needs less and less nitrogen, your microorganisms are going to be releasing nitrogen into the soil all throughout flower, as the plant uses less and less nitrogen due to its stage of growth, This will eventually skew ratio and acidify your medium, As ph geets lower and lower the conversion of nitrogen slows down but as soon as you ph back up its just going to crank back up nitrification of nitrogen. Keep an eye on your ph. If your plant can't use nutrients faster than they are being released the EC rises, if it rises above 1.8ms/cm the plant will start to stress with yellow tips, leech her back down (make space for more salts). Keep the EC in range, whatever you feed to supplement, try not to add any more nitrogen.

Yes add some calmag of you have some and make sure you let It dry out 80% before watering egain

In video remind lack of potassium, maybe i see signs of lack of magnesium too. Your plants looks droopy, but pots are not saturated full, watering regime - wet/dry cycle is very important in soil grows. With bad watering habbits you create dry spots, roots dont occupy all pot, plants stay small.

Hey 👋 Yep, die brauchen was zu essen. Sieht nach Kalium aus… passt auch zur Blüte… auch wenn es mich wunder, dass die in der Wachstumswoche 2 bereits in der Blüte sind 😉

Any issues that can see?