Super stunted hydro plants.. please help

[Killijin]

I have these in a stealth hydro system ( yes, I know it is overpriced and easy to make) but they are 43 days old and severely stunted in growth. I had some problems with 3 of the plants having clogged feeding drip tubes from algae and not realizing it. I also over-nuted in the beginning with 300 ppm feeding on the beginning of week 3.

Don't mind the super silver haze that is the runt in the bottom, it is getting it's own DWC bucket soon. But these pictures are a week old and the plants are not that much larger, they are experiencing a cal deficiency but all I have on hand is hydrated lime although I just placed an order for cal-mag today. Well, anyways my questions are:
"what if anything can I do now to help these plants get bigger and stronger, if anything?"
"can i use hydrated lime in the unit itself without gunking up the works or can I make it into a foliage feeding?

thanks for any and all input,
Oh the 5 other plants in this grow are smurfberry from sagarmatha.

 

[kryptogreen]

What is your ph?

 

[kryptogreen]

Ph is always the first place to look whether its soil or hydro. Ph out of wack has been my problem the majority of the time when I have had an issue. Hang in there an experienced hydro helper is here and in the mean time make sure your ph is 5.8-6.0.

 

[Killijin]

5.9

 

[Hugo]

hey kill,

It looks like you have a strong nytrogen deficiency and a magnesium deficiency aswell.

What's your feed schedule and quantities? Depending on what it is you can foliar feed with a grow nute, untill your cal/mag doesn't arrive. What's the brand of the cal/mag by the way?