Whats best nutrients for canna

I just wondered what peoples experience was using coco coir feed 1 part, ive started my grow with it and having nothing but problems leaves turning yellow and there only 10 days in. Should i change my feed to something like canna A+B or is there other nutrients i can use.

My setup is 2 x 600w cool reflectors with 6inch extraction and filter

Intake 6 inch fan

2.0x2.4x1.2 grow tent

8 big pot wilma system

canna coco natural and clay pebbles

day temp max 25 night temp 20

Any info and help would be great. cheers
 
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