Need Help !!

i have 2 females both on 24 hr light, two 70 watt hps (perfect for vegging ) they have been vegging for about 4 to 5 weeks, using home made hydroponics system. I've fed them every 10-14 days : IONICS GROW or when the tank needs topped up, theres healthy root systems and there dosen't seem to b any changes in colour of fan leaves but over the past couple of days my ladies are lookingreally .
the leaves look like theyve flopped and look quit flimsy.

can anyone help me out or any suggestions

It's a good idea when growing inside to put a fan on the seedlings asap. Put the fan close enough so that you can see the plant leaves moving. That will make the plants grow a stronger main stem. Also, when you move the 2 or 3 week seedlings into the hydro I put a rockwool cube around the base of the stem and tape the cube closed.
good luck.
bigsteve