Alright, I have my 125 set up now, and between my W/D and Fx5 i have plenty of bio filtration. I want to use my AC as a 100% mech filter. I planned on having the normal 110 foam on the bottom, but does anyone have any good suggestions for some finer foam for the next 1-2 levels in the filter? Maybe a real fine foam for water polishing on top? Thanks for the help.