This is probably a sign of calcium/boron deficiency
Add some trace elements, Seachem Flourish helps a little
Or do a water change regularly, twice weekly
Or put some crushed corals in your filter.

"Izuan Wahab" wrote in message
...
After searching the internet I still can't find what's the cause of glassy
leaf. All the new shoot on the fast grower plants are showing these sign.
Please help me.

TIA
Johnny.my