Fish questions im worried

hey, im new to fish and i got a Mollie a few days ago. im concerned because she isn't eating and is often scared by movements. i dont know if this is just normal for Mollies or not beause i have no experience whatsoever. you may recoginze me from my FISH FORUM in Off-Topic Discussions...x anyway, i've talked to many experts about this and they still haven't responded so......please please comment, leave advice, or some thing to help, tips, anything that may help.........
   
Thank you

New fish tend to not eat until they get used to their new environment. She is just scared and will get used to you being around her aquarium soon.

Your Molly may be in for some trouble. Are you changing 25% of the water every week? Be sure to use a water conditioner. A siphoning hose, sold at the pet stores, can be used for this. A quick-fix for mollies is to add salt to the water. You could use aquarium salt, but the best option would be sea salt. Mollies are brackish fish, and thrive in salty water. I use 1 cup of sea salt per three gallons of water. Very few diseases can exist is brackish water, so your molly should be basically set for life if you choose this option. Nobody told me anything when I first got a fish (a molly), so I hope this helps you.