Looks like a little cal mag def. you using RO water right ? problem with that is it has no micro nutrients in it grab yourself a bottle of cal mag from GH or any cal mag and hit it with a light dose and watch those babies turn green !!! also ph your water after you put nutes in!!! looks a little light green could use a little bit more nitogen not too much if your using RO water most likely your problem. RO water doesnt have the trace minerals in there like tap water ..... but with RO water you get more control over you overall PPM of your water and nutes.....