UPDATE for the love of god somebody help me

Day 16: Added another 1/4th strength BC Boost, BC Bloom, Thrive Alive Red, and MagiCal. Total strength in the res should be around 3/4. ppm should be around 750 plus whatever was in my water to begin with.

Two plants are starting to look healthy again except for some yellowing on the bottom leaves, which is actually starting to green. The other 3 seem to be getting worse. they are still drooping and the tips are turning a brown green color (looks like bruising) while the middle of the leaves is turning a brighter yellow. It also seems like they have stopped growing.

anybody?

P.S. thank you crabby for your input