hi this is my first water cooling and im trying to plan my loop do this work? let me know u guys idea. im thinking to put the output facing the back to make it easier to loop and the in put on top or the front?
adding another two fans at the bottom won't do much good in this case. If anything they will turn the case inside into what's is called a hydraulic equalizer. This may sound like something you may want, but it is not. It the air in the case will form a vortex in center of which you will have area with no flow at all. It is an effect not dissimilar to what you see in the eye of an hurricane.
Also it if you have 3 fans pushing air in, you don't necessarily need same 3 fans at exhaust side. If anything it is beneficial to have the case at slight overpressure, so you don't have parasitic intake from small grilles and such. You will accumulate lot less dust in the case over time that way.