Hilke's Herbs Master Kush & White Diesel

Hey guys! Welcome back to Hilke’s herbs and a strain mix of 2 Master Kush ladies 2 White Diesel ladies. The plants seem to have problems but I have no clue what it is. The oldest leaves start becoming yellow also the middle ones do. The newest leaves are ok. Plus I found out that the leaves are hanging when the light is turned off. Is this normal? So far they are doing okay but I‘m not quite sure to be honest. If you have any advice please let me know! Stay tuned! 🌱