Hello soulgazzer and WELCOME to Fishlore.
Well water generally is excellent for aquaria. I add salt to my aquariums as well, but you may have a potential problem with the Pleco with added salt. Some do OK, but many get sick from the salt. scaleless fish don't do well in salted aquariums. Keep an eye on him hopefully he will do fine. Oscars and cichlids do well in hard water,high PH and require trace amounts of salt. Adding salt every month (without changing the water) will eventually give you a high
salinity reading.Keep in mind salt does not evaporate when the water does,The water level will drop from evaporation,but the salt remains in the water,so be careful not to add too much.
Keep an eye on those 2 issues and everything else sounds good.