Welcome to MAAST, you would get more responds if you post all these questions in the GENERAL DISCUSSION forum. This is a very slow traffic section .It's usually just questions for the MODs and BODs to answer. A sump(must have item) is like another tank that houses all the goodies (like skimmer,heater,fuge,return pump,auto top off port,etc.). Anyway just post some pics and what you want to do with your tank.There will be plenty of people here to chime in to help...Ok let the fun begin..