yes i have done both ludwigai and riccia under low light with out co2. now there are some ludwigai species that just wont handle it but you left the statement open.Ever tried growing Ludwigia species under low light and no gas?? What about HC...Riccia? ...the list is endless.
HrHagel i wouldnt call it a fashion statement more of a lack of knowledge. its one of the reasons i tell people to start off with low light set up get the basics down then go forward. so many people jump straight in with too much light with out the basic understanding. it takes time and some people just dont want to take the time to learn. they think co2 will fix all problems where it can help but its not the end all solution.