Tropical to Marine

Hi everyone I'm in the process of changing my 100g agua one tank in which I've kept tropical fish to setting up a marine tank. At the moment I have two filters a aguamanta 600 and a agua one aguis 1050 and two heaters I've been looking at two protein filters a reef octopus bh 300 and a deltec mce 600 which are both hang on back skimmers but not sure if I will be able to fit to my agua one tank any advice or opinions on the above would be of great help, I'm looking at stocking the tank with live rock and fish Thanks.