orgasoilux - every bag is a little different.
I've heard reports of plants toasting in that soil, but lately it's been more positive.
you can use clean water till first sign of deficiency. I wouldn't put a seedling directly in orgasoilux, I'll pop it in sphagnum or rockwool then move over to orgasoilux when they're just a bit bigger than the plants in your photos. also use the orgasoilux just as it is, don't add stuff, it's already fully loaded. only thing you can use is a healthy dose of microbes when transplanting and that's it. clean water, you'll be able to get the plant to above your knees or "ready to flower" size on just water and the nutrients in the soil. first time you feed will be before flowering so you'll wana go for Biobizz fish mix at that point and when you flip over to flower you obviously gona start giving bloom nutes, but switch the Fish out for the Grow, as the Grow has more sugar for the microbes and you want less N at that point and more P and K.
when reamending the Orgasoilux I would recommend emptying all your pots into a 100L bin or pot, dump 10L of jamies elemental blend in there, work it through, water it, let it stand for about a month to two months, then you got yourself a super soil there. that elemental blend is fucking