Update
I've been a tad neglectful of these the last 2 weeks, but it's now go time. They have been moving along but are showing some issues, which is handy as they will make for some good guides as I fix them. They are in need of a higher feed and calcium deficiency has set in, all easily fixed so all good. I've not tucked much but will be in the next few days.
To combat the calcium def id normally add calcium to the feed at 0.5ml per liter for drench feed. Id then foliar feed with Epsom salts. This is my "loading up" term I use a lot. I've ditched all that and am going to try 
@GHO Synergist, it's an organic foliar feed. This has gone in at 5ml per liter and been sprayed all over them, covering all plant matter including under the leaves. I'll repeat this in 2 days. I will then continue to with 
@GHO Soluble Fulvic, the stuff is magic powder IMO and the plants love the stuff.
Feed consists of:
1ml per liter Canna A and B
PH set to 6.0
excuse the hosepipe lol. I got fed up of drippers blocking up on me. I now have 13mm drippers  
