Hi everyone. Im new here and ive been trolling around looking at the stickys and other posts. Iv learned alot but im still confused on what to do. I have a 125g tank and 2 fluval 405 conister filters that has always been used for freshwater. I went to a local spot that specializes in saltwater fish and he wants me to spend $1000 to retro fit my tank and get a sump setup. he also said i can use my canisters if id like but wouldnt recomend them. Im curious on how to start this. Where do i put a protein skimmer? do i still need a sump? Do i just fill my tank with salt/water and bio materials in my filters and turn them on? If i need to use a sump can i use my old 50g or 20g tank? any help id like to get my tank started so i can begin the process and eventualy have some fish and coral. I want semi reef tank mostly fish but a good amount of reef. thanks!