Salt in Tank?

Is the jury still out on the addition of salt to tanks, or is there an
agreed-upon answer?

We have a tank with Platys and Corys. The LFS told us to add 1 tsp salt
per gallon of water. "The Simple Guide to Freshwater Aquariums" says
not to add salt.

Is this really a question of salt, or of the mineral content of the
water? I got the water quality report from my town (see below). Can I
use this information in any meaningful way to know which fish will do
best in my water or what (if anything, e.g., salt) I need to add?

In the "help please: thread, Eric Schreiber wrote:
- Maybe add salt (unless you have lots of live plants, scaleless fish,
cordydoras, or tetras, none of which like salt). No more than 1/2
tablespoon per gallon.
Is the salt in my tank going to hurt the Corys? If I stop adding salt
to the water changes, so the salt level eventually tails off, will the
lack of it hurt the Platys? If we want to add Neons or Cardinals, are
we better off with or without salt?

Is there a good site to check which fish want the salt and which do not?

As I said, I do have my town's Water Quality Summary. Here is an
extract:

Substance Highest Level Range of
Detected Levels Found
PRIMARY PARAMETERS
Barium 0.02 ND-0.02
Chlorine 1.5 0.07-1.5
Haloacetic Acids (ppb) 31.1 ND-31.1
Fluoride 1.4 0.6-1.4
Nitrate 1.8 ND-1.8
Radionuclides (pCi/L) 2.9 ND-2.9
Trihalomethanes (ppb) 59 ND-59
Turbidity (NTU) 1.1 ND-1.1
SECONDARY PARAMETERS
Calcium 24.7 6.1-24.7
Chloride 99.9 12.3-99.9
Chloroform (ppb) 24 ND-24
Hardness 88 22-88
Iron 0.8 ND-0.8
Magnesium 6.4 1.5-6.4
Manganese 0.21 ND-0.21
Potassium 28.4 1.9-28.4
Sodium 43 9-43
Sulfate 25.5 6.7-25.5
Total Dissolved Solids 215 83-215
Zinc 0.11 ND-0.11
LEAD & COPPER PARAMETERS
Lead (ppb) 8 ND-25
Copper 0.33 0.008-0.48

Thank you for any and all help.

Dave