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1. Are you growing from seed or clones? Clones 2. How old are your plants? Cloned 3 weeks ago 3. How tall are your plants? 3-5 inches (see photo) 4. What size containers are they planted in? 11 litre 5. What is your soil mix? Canna pro 6. How often do you water and what type of water do you use? Every other day, bottled spring water 7. What is the pH of your water? atm don't have anything to measure 8. What kind of fertilizer do you use and what is its NPK ratio? only water atm, I have some biobizz grow but haven't used it yet 9. Do you foliar feed or spray your plants with anything? spray with water, and one time biobizz leaf protector 10. What kind of lights do you use and how many watts combined? (HPS, MH, fluorescent, halogen, incandescent "plant lights")600w hps 11. How close are your lights to the plants? 2.5 feet 12. What size is your grow space in square feet? 100cm by 100cm 13. What is the temperature and humidity in your grow space? temp 28C humidity 49% 14. What is the pH of the soil? don't know 15. Have you noticed any insect activity in your grow space? no 16. How much experience do you have growing? 2 outdoor grows, this is the first indoor
Combination of PH imbalance and under-fertilization. It wants a lot of stuff you're not giving it (essential nutrients) and at different levels (ph) than what you are giving it. Considering you're in canna soil, canna 2-part nutes would be a very safe bet. Just follow the feeding instructions on the bottle.
EDIT: Just saw the part about having biobuzz. Use it.