E-indoor or outdoor = indoor
E-soil, soilless, coco, aero, or hydroponic = hydro
E-specific medium = grodan rockwool cubes
HCL-Hydro/aero/soilless system type = NFT
E-Water source = tap water
E-Source water pH = 7.4
SCLR-Soil or slab runoff pH = 5.7 - 5.9
HRT-Source water EC (if hydro) = 0.65
E-Age of plant = cuttings 7 weeks old
E-Type of fertilizer = canna aqua flores A+B
E-Rate of application = 1.7-2.2
E-Lighting source and distance from plant = 400w hps / 12-14 inches
E-Air temperature= unknown approx 75-80f
HD-Reservoir temperature= unknown
E-Air % Relative humidity= unknown
E-Lighting schedule = 12/12
E-Type of ventilation your room has = 4" extractor and 12 circulating fan passive in duct
TR-Did you pre-soak your media in pH corrected solution? = yes

Attachment 287718

ok here they a a week or so later any ideas on whats causing the rusting/burning was going to add some pk13/14 but not for another week