So I want to cycle my sump before I put the water in my 65 gal, because I still need to do my auto top off before I fill the top tank which makes my sump inaccessible (Because doors arent big enough on stand for me to remove sump). Would I just run my hobby pump into my filtration and just make it cycle like that, and is heat necessary while there is no fish yet? Does nitrifying bacteria need heat?