[oldsaint]

1. mg/L (milligrams per liter) to ppm (parts per million)?
The measurements are identical: 1mg/L = 1ppm
Here are some conversions that maybe helpful
Conversions:
1 meg/L = 50 ppm CaCO3
To convert meq/l to ppm CaCO3, multiply by 50
To convert meq/l to dKH mutiply by 2.8
To convert dkH to meq/l divide by 2.8
To convert dKH to ppm multiply by 17.9

0-10 is ok for FOWLR but 0 is best.

2. If it was dry sand it was not live sand. You might want to go and get a pound of live sand from a few good LFS and add them to your tank to help kick start your LS