I run 1 tunze 6105, 2 mp10 on back wall and i tunze 6125 which i switch out with a new k4 every once in a while to change the flow. This on an 8 foot tank

I almost want to sell my 4 mp40 and buy the pair of mp60 from you when you first have it posted.

4 MP40s are better than 2 MP60s.

I get different flow pattern at 80% flow, but with the mp60 I can probably get away with 30% of flow and it should be near dead silent.

on my 400 i have the following (with pretty decent flow everywhere):

4 x 6105
2 x waveboxes

It's still here when ever you change your mind.