hey i just got a dalmatian molly last night. the store said they prefer aquarium salt. should i do the whole aquarium salt deal? and if i do, will other fish be affected by it if i get another fish or 2 in the future? and can my dalmatian molly live with a catfish? i feel like i need a bottom feeder to help clean out my rocks. and how often do i need to clean my tank and do water changes? any advise will help. thank you!