any one no why i have these yellow patches?

please help a guy out

It maybe the first signs of the compost being a tad too hot.

<polishes crystal ball>

How old are the plants? What compost are they in? What else are you doing if anything?

im growing in canna coco professional on its own and the plants are just under 3 weeks old from sprouting but just started using the canna coco a and b nutrients and rizotonic
and the plants have been transplanted in to bigger pots since the patches started and i have fed them 1 ml of formulex in 2 litres of water and can see that most of the plants are looking better

i am feeding my plants by hand well hand watering but i only feed once a day has any one got a feeding schedule
i could use with these nutrients as i am not to sure how much to give and how many times a day i have all these nutrients to hand canna a and b rizotonic formulex canna pk 13 14

i am growing in canna coco professional on its own
my pots are all in trays for me to drain my self and all the plants are over 2 weeks old since sprouting