Also I just read you have a 10 gal rez.....sorry, missed that before. No wonder your plants have issues....that's less than a gallon of nutes apiece.

I wouldn't try to go with anything less than 20 gals for your size setup UNLESS I were willing to change to fresh nutes DAILY....in other words...change my rez to new nutes every single day. That's the ONLY way your plants are going to get enough to eat with a 10 gallon rez.

Good luck.

edit: Yes, I'm sure now......they need more food for sure.