New main pump, suggestions

[FishyFishy!]

That is a bit odd i'd say. I had 2 X Mag 9.5 pumps running on my 131 and it was silent as can be.

I wouldn't think again about recommending a newer/bigger Mag pump with a manifold system to go to your reactors. If it is loud, there is a reason for it usually. Something is most likely vibrating. Vibration dampening on any internal pump is the key to silence.