I have a excess amount of Phyllanthus fluitans AKA red root floater for sale. enough to cover a 10 gallon $8
I have it growing in cincinnati tap water,low nitrates will intenisfy the red.CO2 is not needed but will help,flowers are small white cups...Very neat plant easy to grow
Here is a pic of it flowering,it is the foreground plant in the pic.

Emial or PM