This is my first grow. the ones in cubes are about a month and a half in. the ones in pots i just added last week. just worried about the older ones. they seem to be doing pretty bad. there under 1 thowie right now. pretty good air circulation temps about 75 ph =5.8 ppm 700 humidities 50 watering as needed trying not to soak but give enough dont know whats wrong. can anyone give some suggestions?
Your rockwool looks very dry in the picture; the plants are stunted and probably have salt build-up. The stats you listed should make for a workable solution if applied correctly; I think you are watering too little at each watering. When you water try to ensure that at least 20% of what you pour in runs out the bottom. But, right now water each plant a lot, you want to flush out any salt/fertilizer build-ups that may be present. You should apply enough 1/2 strength solution that 80% of what you pour in runs off. This should be about twice the volume of your planting media, but, just make sure you get a bunch of runoff from each plant. I hope this helps