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Hi, ok they are droopy because, nutrients concentration in coco starts to grow, now it's a good time to stop feeding every time, and give it plain pHed every other watering. Adding coco is a bad idea, as I already mentioned, coco must be washed with flushing agent before it can be used as there...

Hello ozzy, how are they doing?

Ozzy come on mate, They have doubled the size in 48 hours, and colour turned nice and healthy. Just keep doing what you doing, and don't try to make things faster, it will only make it worse.

Cut down on your feed, for autos start with 200 PPM total and slowly increase to 800 at middle of flowering.

All your root mass right now is in soil cube, and it's saturated with water, there is not enough oxygen in the cube. Dont water hem from the top. You should be using rockwool cubes when growing in DWC, there should be nothing organic going in your reservoir. Also I know that UV spectrum...

If you are adding cal/mag than it must be pH, 5.5 is a little low, raise it to 6. I would also reduce general PPM but increase cal/mag to 1/2. But that is just my personal view on this problem I am not 100% sure what it is. What nutrients and additives do you use?

If strain is not auto-flowering and you are not adding cal/mag to their feed, than these guys are right it's must be calcium, but I am still concerned about burned tips.

You are right, it's hard to make an accurate diagnose with out an information. I still would stick to my scenario, will see what the problem is when ill have some info.

I would also say calcium deficiency if I didn't see burned tips of bud leaves, More likely calcium is locked out due to low pH, if he start feeding it calcium it might cause more problems. I would give it plain pHed water with 20% run-off, next watering start feed with 1/2 dose of nutrients.

Set your water to pH neutral 7 before adding nutrients. Compensate for pH with phosphoric acid (pH down), and Potassium Silicate aka liquid silicone (pH up). Unless there are slow releasing pH buffers in your nutrients, pH shouldn't fluctuate.

This is a nutrient burn and pH problems. I need some information about your feed and method, what growing medium?

Hello Ozzy, they look a little over watered, do you keep the pots on the dry trays? Stop watering them daily until they get bigger, feed every other day. However they are recovering which is a good sign.

Looks like moister stress, how frequently do you water?

Don't feed every time you water, every other day give it plain pH'd water. Looks like salt build up caused pH fluctuation and nutrient burn. I

Your plants look healthy!! I still think dolomite lime is bad idea, especially in this amounts, 150-250 pebbles sound like allot. It will stick to your medium and slowly enrich your medium with calcium and magnesium, also at some point it may bring you medium to alkaline pH level. In any case...

They are obviously in better shape, little yellowing is due to low nutrients in your medium. keep on watering them daily and give food every watering until they become healthy green colour, than do feed,water.

Fed,feed,feed is a risk of salts build-up, this is why feed,water,feed is better in coco

Yes Dyna gro protekt is liquid silicon. It strengthening the plant stems and is the best pH up solution. In coco, run-off won't hurt the plant, it will just cost you more, 10% run-off is enough

Hello Ozzy, how are they doing, are there any improvements?

I wouldn't advice to use dolomite lime, it will overdose calcium and mess up pH. Liquid silicone is good enough to correct low pH, it's a slow process though, you cant't correct it in one day regardless of how much water you throw in the pot.