Hi guys, I got some of these plants from my workplace... I'm working on a resort island in South East Asia... I put them in my tank, and to my suprise they've been growing well and beginning to become abit blueish... can anyone ID this plant?

http://gallery.pethobbyist.com/index.pl?photo=127291
http://gallery.pethobbyist.com/index.pl?photo=127290
http://gallery.pethobbyist.com/index.pl?photo=127289