Dropping Plants with Yellowing tops

Hello I have been having issues with my plants dropping.I recently switched over from veg to flower. While in veg everything was nice and perfect with all leaves reaching for the light and standing high. Now I am in week 2 of flower and all my plants have been dropping and all tops turning yellow. At first the temperature was really low at nights reaching in the low 50s which I thought might have been the problem. I since then raised the temperature where I am 58 degrees -65 at night and 70-75 during the day when the lights are on. My PH is at 5.8-6.0. I am in rock well and use the EBB system where I flood them once - 2 a day but mainly once. I looked under the block and all the roots look good with new white ones coming out. Growth seems to have stopped and no signs of any bugs at I did a root aphid wash in veg and a bug bomb week 4 of veg before kicking over. Any help would be greatly appreciated.

How big of a block are you using? You could be watering too much, which could cause drooping.
It has been said that when in flower is is good to have the Rockwool a little bit dryer than in veg.

One way I have been using to find out just how much water is in my Rockwool is to take a pipette and try and suck water out of the cube.

looks really overwatered.. roots asphyxied/lackin oxygen
water temp ?

SnidleyBluntash said:

How big of a block are you using? You could be watering too much, which could cause drooping.
It has been said that when in flower is is good to have the Rockwool a little bit dryer than in veg.

One way I have been using to find out just how much water is in my Rockwool is to take a pipette and try and suck water out of the cube.

Click to expand...

I am using a 6x6 Grow-dan, whats mind boggling is this is the first time this has happen. I have done everything the same and been very successful in the past, Only thing different is the strain but I dont think that would have anything to do with it. I have been flooding once a day for 10 min and then the pumps turn off. But thanks for the suggestion of the pipette. Any other suggestions on what it can be?

kingromano said:

looks really overwatered.. roots asphyxied/lackin oxygen
water temp ?

Click to expand...

Thanks for your reply, How can I tell if they are asphyxiated ? I have been flooding once a day for 10-15 min and the water temperature is 60-65. If they need more oxygen would you throw a air pump in the reservoir?

ok temps are not a problem .. so its the frequency
like snidley said they must be lighter every morning before being watered
they must dryout during night
moderatly
never bone dry