I have a total of 350gal of water and i'm using an iwalki 70 mdrlt and i think i'm not turning my water over as many times as i should be in my system. my 180gal display is on my main floor and my sump is in the basement. theres about 16 to 18 feet head room and don't think the iwalki 70 is making it so i would like to get an iwalki 100. I can take suggestion on another pump but i want one with a good ellectric rating and it has to be 1"in and 1" out,do not want to have to change plumbing. I have a used 1Year old iwalki 70 mdrlt and need a 100mdrlt. i'm looking to trade or buy the 100mdrlt. please let me know