Feedback on my first plant

Nitrogen in of itself would not cause the interveinal chlorosis as it is. It would be far more even and work its way from tips inward. Would be more plain chlorosis than interveinal. Red, purple, or blueish stems and are a classic indicator that a plant is struggling to uptake or is demanding more P. However, the reason for this deficiency is rarely just a lack of P in the soil; it is often a lockout caused by environmental issues, with lack of oxygen being a major culprit. Once oxygen supply becomes scarce in a medium mass flow will slow dramatically. Calcium (Ca) and magnesium (Mg) are primarily taken up by plants via mass flow. Phosphorus is unique in that it can bind with different elements depending on whether conditions are acidic or alkaline. In alkaline pH7.0+ soils, phosphorus binding shifts to Calcium and Magnesium There may or may not a be a direct deficiency, but looks more like a combination of things going on. Gluck.

Salam Leofs! 👋 Welcome to the brotherhood of growers! For a first run, you are doing great. 🌿 Let's break down your "Modern Engineering" plan here: 🛠️ Topping vs. LST: Just to clarify, these are two different tools! Topping: Cutting the main tip off ✂️. This splits the main energy into two new branches. If your plant has 4-5 nodes (pairs of leaves), yes, you can top her now! LST (Low Stress Training): Bending the branches down to expose the middle to light. You can do this with topping or instead of topping. Hungry Girl: I agree with @Green_claws. If she is looking a bit lime green/pale, she is asking for more Nitrogen (Grow Nutrients). 🍽️ Don't be afraid to feed her! Environment: 26°C / 70% RH is a perfect "VPD" sweet spot for vegetative growth. She loves that humidity right now. 💧 My advice? Top her once (snip the very top), wait 3 days for her to recover, and then start bending (LST) the side branches. That’s how you get a bush instead of a Christmas tree! 🌳 Happy Growing! 💚

Yeah nice mate. Defo in need of nitrogen, don't be afraid to feed it