Looks like purple cabomba. If you want to keep the tips, pull the plant out, cut it where you want and replant the top. If I remember mine correctly if you cut the top off and leave the bottom it will split there and shoot up 2 new tips. I usually took the tops off replanted them and then replanted the bottom sections behind them. But I have a 92g corner tank so there is a lot of floor space.
Last edited by Kubla; 11-04-2016 at 07:47 PM.
Reason: added info