Started using Canna Boost about a week ago. Noticeable increase in growth and dank. Using 1ml per Liter in the reservoir. I was hesitant because of the high price but this stuff is great.
After playing around with the Masterblend ratios and weights I feel pretty confident in my current mix. What I thought to be tip burn from nitrogen turned out to be the early stage of Calcium deficiency. As Nitrogen and Calcium come in the form of Calciumnitrate you can't drop the N without the Ca. To avoid this I bought Canna Mono Calcium with 11.6% Ca. Now I am able to dial the N down to 120-130ppm and keep my Calcium at about 150ppm. Anything lower than 120ppm of Calcium starts to show deficiency symptoms. Same goes for the Nitrogen, 120ppm is the absolut minimum right now. I am also going to increase the Magnesium to 50ppm with the next tank refill.
I am pretty happy with the Masterblend 4-18-38, Calnit 15,5-0-0 and Epsom Salt bundle. You don't have to buy a seperate flowering blend if you get a mono calcium fertilizer. The plant loves the Masterblend. Looks way better then when using Canna AB...