I have had this 40b running for a few years and have struggled with. I didn't realize how scratched the tank was when I bought it used. So the changes being made other then the tank swap is I'm going to %50 RODI and adding O+ under the substrate.
Here it is
4xT5HO 2x6500K 2x5000k Zoo Meds (Individual reflector)
Light is 22in about substrate
Added 20grams O+ under substrate
CO2 reactor runs 24/7 and keeps 4dKH solution yellow
So I'm not adding any fish until I get happy with plant growth so I can keep CO2 up. Figure that eliminates that as a possible issue. I'm not certain what these plants are but I believe Ludwigia-Cabomba-Moneywort-Didiplis Diandra?
This is supposed to be my tap
Phosphate as P: 0.8-1.3
Chloride: 18 (rises in winter from road salt) Total dissolved solids: 175
Any and all advice comments are welcome. First picture is what it looked like before I tore it down. All the swords-crypts-anubius are being traded in at the LFS for new plants.
Bump: Seeing these pictures reminded me, I thought having 3 bags of black Flora Max and adding 1 bag of brown Fluorite wouldn't be that obvious. My god was I wrong!