Stop up rooting and replanting the tops for awhile.
Let it it grow in and root well.
Top only as it gets too tall. It always seem to like some shade in my tanks.
It's picky about CO2, not light demanding etc.
It's easy ti kill it if you drop the CO2, and it will get BBA, holes, lose leaves and look like crap, with good CO2, it turns lush and pretty.