Blue Fire (blue dream x fire OG)

I have repotted the seedlings as their roots had filled the majority of the pot. The finish pots are a bit too big for the stage i think as it potentially opens up a bigger chance for mistakes (mainly overwatering). I sprinkled mycorrhizal fungi in the coco before the transplate, after i watered them with plain ph7 water with a 20% run off. Possibly loosen salt build up, if there is any. I've been thinking why the growth is slow but they seem so healthy. Now that the Canna start (NPK 1-1-2) period has ended. I will now see a better speed of growth with Canna A+B (NPK 5-4-3 combined). The stems are turning purple so I've included some Cal-mag in to the mix. My tap water is 7.3PH and 0.457EC, so I thought it would be ok not using a suppliment, must be higher in other minerals. I'll just include it every other feed. The plants have grown through nearly all the drainage holes in the pots. I will place them in the finish pots on Friday (start week 5). I may have watered a little too heavy, as the substrait isn't drying out fast enough.