I was planning to get an FX5 for my 150 but it wont fit in the stand, I even thought about cutting the hole bigger but money is tight and i dot want to tear up my stand. FX5 excluded, and money being tight, whats the best single C-filter for the money? Fluval 405, Filstar XP4, Cascade1500(currently using), and the new marineland filters are popular around here. If i had the $500 id go out and grab an Eheim pro3 but po folks dont have that kinda money!