1st Time Grower - Plant#1 Mystery Strain

Hey Growers, End of week 10 from seed Earlier in the week I began noticing an orange color on some leaf tips, I probably overfed them nutrients so I fed them just water with a ph of 6.0 on the following feeding schedule and the leaves are looking better now. Last week a weird smell was coming out from the colas, its slowly changing. Its now starting to smell like 🍃 🍋 ⛽️ Noticed a small Increase in orange pistils I want to increase light intensity but I am worried the red stems on the top of the plant will get worst and then affect the whole plant. Only the top part of the plant has some red stems, the rest are all green. QUESTIONS How close am I from Harvesting? When should I begin flushing?