Those look way too small to feed dude! I would give them straight ph'd tap water (between 5.8-6.3 for soil) until they have at least 4-6 leaves... that looks like nute burn.. being that you posted this 2 days ago.. Im guessing they may not have made it... You gotta give those babies some time before you start feeding them.. tap water usually has enough natural nutes in it to keep them alive for the first week or so... once they have 4 solid leaves with 5 and 6 coming in nicely.. you can start with 1/4 strength nutes for a few days and bump it up a little more as they get a little bit bigger.. hopefully it worked out for you!