Plant going limp after 5days of flower!!

been growing like champs for 2monthes, now they are both going limp. why is this?? plz someone help me asap

i use 3 36 wat cfls and i use a simple grow soil that was bought for fast growing plants, temp is fine, ph is fine, i water once a day and i wait untill the soil is crusty like im supposed to. the one plant is now limping and the other is only kinda limp