Any ideas why my seedlings are so light green (they are much lighter not on camera) or is it normal? And drooping? They're 1.5 weeks old and look a little small to me too. Roots look good, they're being lightly splashed with water. I dont start nutes till 2 weeks normally, should i start now? I have done seeds exactly the same as this before and no problems. 25 degrees Celsius, ph water 6.0, 240w led, 20 inches away at 30%ish power. 70% humidity
I start dwc nutes at about EC=0.4 when they first go into hydro. My experience is that nutes need to be ramped up fairly quickly thereafter. My autos don't like much more than EC=1.3, and want less as harvest approaches. I think you have too much light for the food given.
are you using beneficial organisms (ie. bennies?) because I see some darkening on the roots and that means root rot. Also the cube looks too wet. Its tricky getting rockwool to the good moisture level when first learning.
A cheaper, easier alternative is Clorox, which will also kill beneficial bacteria. I add 2 drops per gallon per day. Works well, I've never had rot.
I think you are better off using hydrogen peroxide, although bleach is ok I suppose. Kinda high in chlorine u know. I keep this article around to share, have a 5 minute read: 7 Facts That Will Make You Rethink the "Sterility" of Hydroponics - ZipGrow