i have 3 pics in my tank now. all opened big and started to grow a lot of small clove. all about 3 months old.
i place the 1st pic where there is mid current flow and it settled at the mid of my tank. 2nd pic, the bigger one at the high flow at the higher side of my tank (250W MH light). the 3rd pic, it didn't open for 2-3 weeks cos i keep shifting it to the suitable location. now at the bottom of my tank. once it settle, it started to open
don't worry, it will open when it is settle