Slow growth or am I just being an overprotective parent?

[Silkadin]

Attachment 363720Attachment 363721

Soil or hydro or coco: coco

Strain: Northern lights white label

Photo or Auto: auto

plant age: 8 days

pot size: 15 litres

has it been repotted? and when?: nope

soil type: canna

nutes or additives used and how often for soil: 2ml rhizo per litre and 1 ml canna a and 1ml canna b per litre

Air temps (max min):30 max 22 min

Res temps (max min): n/a

humidity: 70%

lighting type and wattage (hps, led, cfl): 200w dual cfl

Light schedule: 18/6

ph level:6.2

EC (hydro and coco only)

Background EC. 0.5 after nutes added. 0.244 before
(Was using ph easy down 25% but it raised ec loads. New reg 81% arrived today. Hopefully then I can bring ph and ec down a little

feed schedule and nutes (for hydro and coco)
250 to 500ml per pot every 2 to 3 days

They seem really small and the 2nd plant looks wilty and frail. See my grow diary for more info and thanks for looking in