It looks and sounds like a Fe issue but it could be many other things too.
How long have you been dosing csmb? Any idea what ppm Fe you're dosing via the csmb?
KH is really high. There's going to be a lot of plants that simply wont do well at that level. Many out there that will though, so you'll just have to do some research. Plant data bases like Flowgrow or Aquaticplantcentral are a good place to see KH requirements.
That's also a really high GH level. If Ca is really high it can interfere with the plants absorption of Fe and some other micros (K and P too) so you may have to dose higher amounts of these things to compensate
Also since you are showing some nitrite, the tank is still in its early stages as far as cycling goes. This can present a problem for plants in some cases, esp if the soil is leeching a lot of ammonia. Im not familiar with the substrate you mentioned but it might explain why there was some initial melt
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