my fertz

hi all

I,am using a weakened solution at the moment for my babies 10% of the recomened solution of whats on the bottle.they are 4 weeks old.

Now these are quite rooted into my 5 inch blocks of rockwool two are smaller than the other two (i have four babies all together)

i am going to transfere them into a flood and drain system today..I,am just wondering how much ferts i should use in my res?

on the bottle it says 2ml per litre of water,,, each of the two fertz.

Thanks inadvance, cron.