Your welcome
Do the spots look like grains of salt? If so it's probably
ICH which can be fixed by increasing the temp slowly to 83-84F. Leave it there for at least 2 weeks. Increase aeration to make up for the lack of oxygen in warm water and vacuum the gravel really well to get rid of the spores.
Do you know your readings for
ammonia nitrites and nitrates?
Stress can often times bring on illness. It looks like your tank was very overstocked.
With the amount of fish you have you should consider returning some or investing in a 20 gallon tank.
Good luck