Referring to your substrate:
This is an aqua soil, meant for heavy plant growth and bright lights, as it is rich in nutrients until worn out and acting like a normal substrate.
You want to vacuum more cautiously and not too rude as the granules can fall apart otherwise.
It is also softening the water and lowering the pH to a certain degree.
So you can leave the pH and do 2-3 water changes per week in the beginning and daily testing according to the Two-Sentence Tutorial for fish-in cycling.
Planting the substrate is a great idea.
If you need any help with plants, let us know in a separate thread!