Newbie Dsm Iwagumi Need Help

Hi all! i just started DSM with HC cuba and dwarf hairgrass with my hardscape recently.
Hoping it will turn out well. It is just around the 3rd day.

60 x 30 x 35 tank
Aqua soil
HC Cuba and Dwarf Hair grass and one plant that i forgot whats the name =x
Beamswork HI Lumen 60 LED light

Day 0-4






Will continue to update! Feel free to give suggestions on how i can improve and get this tank set up in the long run!

 

Day 6

I have been running the lights for 12 hours a day using a timer from 6pm to 6am. It seems that the HC cuba is growing but more towards vertically than horizontally. Do i need to trim them or any ways that i can improve? Is the humidity ok?

 

Day 22

It's been a while since i update this.

On a daily basis, i have been giving it light for 12 hours from 6pm to 6am with a bit of misting with air circulation.

i can see that the plants are growing, but some of them are instead creeping horizontally, they are growing vertically.
At the same time, i noticed that there are black stuffs. Anyone can share with me what are those? is it normal? Or is it mould/fungal?








If those are mould/fungal, what should i do?