Looks like K def/lockout.
I'd pot-up to the next size (do a heavy watering with plain water and let dry slightly first) and maintain your soil pH right at 6.7- water with whatever pH fert solution gives 6.7 runoff.
stinkyattic Reviewed by stinkyattic on . Deficiency or over-nute? Leaves look strange E-indoor or outdoor - Indoor E-soil, soilless, coco, aero, or hydroponic - Soil E-specific medium - Soil + Perlite CSL-Soil type/brand - Canna Terra Pro SCL-Anything you have added to the soil - Phosphoric Acid to the water to lower pH a tiny bit SCLR-Soil or slab runoff pH - originally 7.5 from the tap, I bring down to 6.8 with H3PO4 E-Age of plant - just over 5 weeks E-Type of fertilizer - BioBizz Grow (NPK= 8-2-6) E-Rate of application - water-water-feed, but they got it a bit early Rating: 5