Don't feel bad about the Ludwigia 'Pantanal.' It, along with a large portion of the plants we grow, are not as easy to grow in water around GH 14-16+ than in GH 5-9 or below.
I have found the Rotala genus, especially macrandra and sp. Nanjenshan, to be very tempermental when grown in hard water. They do grow, but growing them in water around GH 5-6 is effortless by comparison.
I have managed to observe this recently in my 10g, where the sp. Nanjenshan began doing poorly when I went from 50/50 tap/RO mix to 100% tap water.
Having jungled tanks between both Miami's softer tap water and Chicago's harder tap water, I have observed this reaction several times.
This is turning into an impressive layout. I'm especially keen on the beautiful foreground and small stand of Ammannia sp Bonsai on the left.
Carlos
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