First Grow Purple Skunk Auto

I started with 3 seeds of the purple skunk auto xxl and of the 3 I had 2 successful germinations using a glass of water in dark cupboard. I first tried damp cotton wool to germinate with no luck. My third seed came from a bag of unknown strain (I was told it was stardawg but have no way of confirming this!), I'm assuming it's a photo plant so planted them all at the same time with the intention of trying a super long veg on the photo while the autos run their course. I'll be using the general hydroponics range nutrients (micro/grow/bloom/calmag) for all plants,and I'll be using 18/6 light cycle.