What's a good ground cover for a tank with moderate hardness, good light and
CO2?

A Tropica search turned up this one Lilaeopsis mauritiana , any better
choices? Also, what about gravel vacuuming when you have a ground cover? I
gather skimming the surface to remove any loose debris is safe? I imagine
the fertilizer requirements really jump with a ground cover? I have a bit of
shade from the Ludwigia, will this be a problem for the Lilaeopsis?

Thanks.