Tips on carpeting staurogynes repens

I planted these repens on sat in my tank I would like them to carpet. When I got them they were brownish now turning into a nice green color


My question is, I heard I should wait to trim it to level desired until it fills out the area I want to carpet is this true? Any tips on growing this plant would be awesome!



Corydoras Melanistus and Paleatus playing in some repens



Big Momma Paleatus