Without your water parameters, everyone is just guessing. If you could, please post the following test results:
GH
KH
Nitrate
Ph
Phosphate
Your lighting should be fine with low light plants. By looking at your plants, it seems that there is an iron deficiency. Your tap water may not offer enough iron and the supplement that you are using doesn't either. Leaf Zone has more micro nutrients than macros and the micros are in low concentraions. Check out the iron content. It's likely .10% or less.
Get me those readings and I may be able to offer more suggestions.
Best wishes!
GH
KH
Nitrate
Ph
Phosphate
Your lighting should be fine with low light plants. By looking at your plants, it seems that there is an iron deficiency. Your tap water may not offer enough iron and the supplement that you are using doesn't either. Leaf Zone has more micro nutrients than macros and the micros are in low concentraions. Check out the iron content. It's likely .10% or less.
Get me those readings and I may be able to offer more suggestions.
Best wishes!