as a 5 yr dwc'r, i'd have to agree with jm. their looking great, your half way to the finish, don't go experimenting too much. if your doing individual buckets then try it in one. i'd recommend some kind of beneficial bacteria- i use subcultureB- if your going to try to do some variation on organic hydro. ya need microbes to help break down and chelate organics so the roots can absorb them