Tinkerman,
Those Rotala species need copious amounts of light; more than 4 wpg full spectrum and as high a lumen rating as you can get. The macaranda needs iron fertilization to maintain its color, along with the very bright light.
The diminished leaf size, growth and color is primarily caused by lack of a suitable light level.
You haven't said anything about your substrate, but it needs to be fine and quite iron-rich for those species. Also, both plants like it warm, say 77 to the mid- 80's.
Dave
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