Hey you don't have to switch LFS, just go in knowing what you need to know and take their advice with a grain of salt. Always double, or triple check everything they tell you. I tell that to my customers at the shop. I tell them to research and check everything I tell them because I don't know all and I may misremember something. If you have a smart phone you can look up the fish you are buying on it and determine if it will fit in your tank, fit with your fish, be reef safe and it's care requirements right then and there.