Those look fine man 
Thank you Cole,giving me peace of mind
The 
hides in the details, looks like Calcium deficiency to me, leaves are also too dark, perhaps an excess of Phosphorous has blocked Ca? 
Mine start showing those signs when my ph is off.
What substrate do you use?
@Hempire420 Canna Coco and @George too much N I suspect cause I have to add 50 ml to 12liters of HNO3 to lower my pH with hard water + canna Coco A/B has a lot of N
Also my tap has 50ppm of Cal and 240ppms of calcium carbonates
Rust spots calcium def
Dark green leafs with clawing , ec buildup in pot ( reduce ec by 0.1/0.2 )
Good call @George : )
Looks like they starting to flower
Maybe reduce canna a+ b abit to reduce n , and start adding pk on top : )
As you up ec thru out grow from here , use lower level of a+b steady but up pk : )
Good catch
You and gorge spot on
This plant Indeed Is starting to preflower,my Osmosis system is on the way,so I Will lower my tap water EC content and start from lower EC to full It up with calmag agent from Canna
@ifish
Canna calmag is high in n
: )
Have a hunt for lowest n to ca ratio
Here I use vita link calmag plus ( bonus of also extra iron : )
If I don’t use my tap I have no problems with level as much as now,I guess.I hope
@ifish
Try 50/50 tap/ro first befor full ro
You may not even need ro , do what I said above about lower ec and up pk
No need to push ec to be at top level ( risky ) aslong as happy in parameters plant will do the rest : )
Pushin ec to top levels is problematic better in safe zone with no worries and nice bud , pushin ec to far does not gain more bud really compared to risk involved , happy life : )
Thank you Brother @ifish
My EC Is under 1.0,I really have Just a Little too much carbonates in my water, thats It Basically.That Is why I bought Ro,I couldnt Always go to the store and buy distilled
@ifish
I understand : )
To start go 50/50 mix
As pure ro can cause problems for some with with ph stability etc
You using ro now ???
Distilled and tap 20/80% and having build up (maybe) or calcium issues that Is not possible to be a deficiency,It probably Is too much calcium and/or too much N.
My Cal content Is 50ppm in water + 240 ppms of calcium/Magnesium Carbonates
27ppm Mg
@ifish
Your plants look great apart from slight buildup and ca prob
I don’t know much about tap in general , mine is very soft
But some of your tap may not be available to plant anyway and not needing to be counted in ec
Only used as stabiliser and some only avail to humans but others would be better to chat on that : )
Ro should help me not going Always to the supermarket,also helping with this problem,since my tap Is medium to very hard scale content,It really leaves a White residue when boiled or evaporated
Thank you Brother,I appreciate It a lot
@ifish
I see it : )
Mine does it to ( maybe not as much tho ) and I’m soft water so don’t overly panic about it , but good to play and sort out and dail in to your tap
Stem looks nice and healthy fat : )