The seed and root structure need to be totally covered. When the leaves are ready they will find their way up to the top. Make sure that the rockwool always has moisture near the seed and root. You also don't need any light at this time. 18/6 will be good once the leaves come out.
It looks like you're getting a rapid recovery. Some of those leaves may have been too damaged to come back to life and may fall off like randr said.
btw...You haven't shown us the roots yet. Are they healthy?