2 questions please answer?

to answer your sick molly question...that is, i believe called "shimming"...they sorta "rock" back and forth...its commom for mollies that dont have salt in the water...go to a pet store and pick up some "Aquarium Salt"...it also helps to reduce stress in fish...only add what it says to add, and if you do a water change...add some more salt..but if you just add water becasue the level gets low...dont add any...water evaporates but the salt level will stay the same.....hope that helps..