Nutes question

i'm a relatively experienced soil grower but I've just started my first full DWC. The seeds were paper towel germ'd, then into rock wool under a 2x55 watt cfl for a week. The Dwc has 10 litres of water per pot and currently on others advice i have the water just touching the ass of the net pot, i know that when roots are established i should leave an inch gap at this point. The plants are all around 3" tall and on their 2nd set of true leaves, temps are 28c(80f) in the chamber and around 22c(68f), this is under a 400hps dual spectrum. i'm going to be using Ionics nutes 3.5;1.5;5.2 for veg. i was told to just add 1ml per litre in at first but my question is 'when should I start adding nutes for real and at what amount( the bottle says 70ml per litre, this seems a bit high)? any advice welcome lads.

Second set of leaves show up you can start 1/4 strength nutes like 100 PPM - 175 PPM. DWC is awesome but realize that reservoir temps are super important dont let that water get over 70 degrees and keep it light proof and you will have no problems.