Why Are The New Leaves On My Alternanthera Crinkled ?

[stu40]

HI
any ideas why the new leaves forming are crinkled/curling at the edges ?
Is this some form of deficiency?

15Gal
2 x 15W T8 (plus reflectors) on for 8½ hrs
2ml easycarbo & 3ml TPN+ daily

 

[Noahs ark6]

According to this diagram which i found online, it says it's a calcium deficiency.