= Local Fish Store.
From the home page here, there is a link for Abbreviations, I suggest you check it out.
I'm not trying to be rude here, but you really do need to do some research on aquarium keeping.
Do you have any aquarium books? You should buy a good basic one at your LFS
or bookstore. Reference material is a MUST in this hobby.
Now please, I honestly don't mean to be rude or disrespectful, but you have to do some reading and basic research on your own. We will be glad to help when we can, but it looks like you are missing some fundamental basics that everyone in this hobby needs to know.
No offense intended, and I wish you the best of luck with your fish.