ok first question is this the only pump in the system meaning if you turn it off there will be no flow ?????????????
my first thing to say would be no don't turn it off if it is too noisy return it if you can and get something that will be quieter
if you cant do that maby try putting something between it and the tank to pad it so the vibration doesn't go into the glass making it noisy to you a sponge can work well for this
It is not my only flow source....i also get flow from the return. I might try to return it but the lfs are jerks sometimes when it comes to returns. Im trying to think of what i can do with that sponge idea....