ok mollies arrived. some are sick with ich and some sort of bacterial ulcer...but for the most part the remainder (which is like 11-12 of them) are quite healthy. seller sent around 16 of them. one died in transit, and about 4 of them are a bit sick from the above mentioned diseases. i gave a salt dip to the ones that looked sick, idk how that would help.
added some salt to the tank, but only 3 teaspoons fro 40 gallons. not going to harm plants, salinity is still at 0 after the salt.
They went to town on any algae they happened to see within seconds of hitting the water in my tank. all seem active and healthy, even the very thin, the sick, and the well fed looking ones.