Thanks all for the kind words.
Ed13
I did what you mentioned before, moved the Alternanthera reineckii to the left a little bit, it turned out pretty well. I had to pull out all the star grass, it grew way too fast .I increased the light hour 1 more hour, hope it will get Didipilis diandra more reddish.
marilyn1998
As Ed13 said, it is the Didipilis diandra, and it doesn't shed. Some of the trimmed parts became black color, but overall it grows well.
There are some things that I didn't expect. Cory mess the ADA aqua soil and bright sand, even I put stones as divider; and the tank is becoming a snails swarm, I probably need to get some loach to control the snails. Is Botia striata loach a good candidate? (never seen it in LFS tho).
I should have put half space as foreground, the discus need more space to swim.
Btw, is there any good way to trim Blyxa japonica? What I do is to pull it out, and separate it smaller and thinner, but this will cloud the water. (Definitely a low light tank next time, low maintenance! )
Thanks to the Excel, overdose made black algae almost gone.