I feed every three days only 1 litre and I use canna terra Vega, rhizotonic, and cannazyme 5 to 10 ml of each in 1 litre. Is that too much? Can't post a pic of the sides till later when the lights are off. The pots are 11 litres Wilmer pots I think.
What's causing the tips to curl and not the leaves? They seem healthy enough only 3weeks old banana Mac growing in batmix. The new shoots start curling straight away?