New Angelfish tank - Iwagumi

Hello,

I'm new to Angelfish but not to the aquarium hobby. I have 4 tanks currently for shrimp and some fish. 2 are well established and thriving.

So I'm starting an iwagumi angelfish tank

• 100 gallon
• Community tank with fish such as rummynose tetra + oto
• Dwarf Hairgrass carpeting plant
• 5ish seiryu stone for the aquascape
• Edit: Aquasoil substrate
• Edit: Plan on going no Co2 but will use fertiliser

I have a few questions

1. What are peoples experience with aquasoil (for plants) and seiryu stone (for scaping) in relation to angelfish parameters
2. My tap water is about 120 TDS, could I use tap water for angelfish?
3. How many Angelfish, Tetras and Otocinclus could keep together if I wanted around 6-10 Angels

If there are any other tips that you would tell yourself in hindsight when you were starting Angelfish, please do share :)