Seedling leaves drooped

Hmmmm I would not worry about ph so much at this stage my friend. PH is something more for later stages of growth at the moment in a dwc system all you should be doing Ideally is spraying with normal tap water feeding with normal tap water and there is one good reason for this. PH up or down are nutrients the way they work is they increase or decrease the ph using things the plant will absorb naturally Ie: Phosphorus which a plant needs anyway unfortunatly seedlings do not need these so I would strongly suggest you have over fed them without relising. This is why i love to use an EC meter especially with DWC with the water being the key component. Pretty sure if you flush the water to tap or a neutral ph they should spring back Im not sure weather your roots are touching the water yet if not you should be hand watering with normal water until the roots get to the resivoir i usually do it twicee a day. Hope this helps bro the dropping of leaves could be a sign of under watering too. so check them rooty roots :) GL with your grow man :)