I want to set up a sump for my 30 gallon using a 10 gallon extra tank. My question is do I need to have a divider area for the return pump. I am going to put my heater and skimmer in the sump. Also would you advise putting live sand and rock in the sump. I have plenty. Sorry for all the questions, the more I research I do, seems the more confused about the sump I become.