Thanks bro I assumed it did as I have left for two days once and they did not look happy so I continued my daily 2 litres each feed . Another thing is that canna nutes state to give them 20-30 ml a and b on their schedule so I have always stuck to the low end at 20. And 20 rhizotonic too all this per ten litres and I always ppm it down to 4 - 500 not ph it to 5.8 but I am constantly getting slight burned tips even when I lower it to 350 ppm . My tap water is 40 ppm . Apart from all that they don't look too bad but I'd like to perfect this before I flower