Peat Moss is not usually used as a planting substrate by itself. It will work, but needs to be well soaked before it will sink.
I have used peat moss mixed with other materials as a substrate, and the 2 tend to separate.
No problems with water quality. GH and KH of my tap water are around 5 degrees, and some gets removed by the peat, but not enough to cause problems.
I have used peat moss mixed with other materials as a substrate, and the 2 tend to separate.
No problems with water quality. GH and KH of my tap water are around 5 degrees, and some gets removed by the peat, but not enough to cause problems.