Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Your KH (Alkalinity ) is so high that peat moss will not lower the pH.
Adding a few minerals to raise the GH (General hardness) is easier than trying to soften the water. I would use GH booster to raise the GH to about 100 ppm.
I would suggest you go with fish that thrive in those conditions:
Platy (3 males, or 1M + 2F. Return the babies to the store often)
Guppy (up to 10 males, or start with 1M + 3F and let them breed, return the babies to the store)
Smaller Rainbow relatives like Pseudomugil (not for beginners)
Small Cichlids like Shell Dwellers (1M + 1F, they will grow a colony)
Snails instead of shrimp.
If you want a soft water tank then blend reverse osmosis water with the tap water until the KH is about 100. Then filter it through peat moss. This will allow the pH to drop into the range acceptable to most hatchery raised soft water fish.
For practice you can buy a gallon of RO water in the grocery store and test some mixes with your tap water. You will probably end up somewhere about 25% tap + 75% RO to get the KH low enough that peat moss will then be able to lower the pH.
If this works you will have some work to do to maintain this tank.
You will need to make that mix of water every time for water changes.
When you buy new fish you will need a quarantine tank (you need one anyway, for new fish) and the fish you buy will be gradually acclimated to the water in your main tank.