You have some great looking Heckels. I have some questions that will help me.
1. How long were they in the planted tank?
2. Did they show any signs of improvement in that tank itself?
3. How long have you had them in Bare bottom tank?
4. Do you have a water change regimen, if so how much/how often?
5. What is your level of expertise in keeping discus in general and Heckel in particular?
6. I did not see a TDS value or I might have overlooked?
7. Did you add any Praziquantel/Albendazole/Fembendazole- if so what is the rationale behind it- none of the above drugs have any transcutaneous absorption and dissolution in water would dilute it enough that mean inhibitory concentrations probably will not be reached. Metronidazole does liquify but the same holds true for it too.
I am planning on doing exactly what you have done- keeping Heckels in heavily planted tank and I am not sure if it is such a good idea but I would love to try it.
Your post is a learning experience for me.
Thanks.