Have a 47gal bowfront and looking to upgrade my filtration. I was looking at the fluval 405 or the rena xp3 but heard some mixed reviews about tons of people loving them and others having leak issues etc... but have heard nothing but good about the fx5. I have read up and everyone says there isn't anything wrong with "overfiltering" as long as it doesn't create too much turbulence in the water. So should I spend the extra bit and get the fx5 or save the dough and stick with one of the other ones.