So the pump was defective ?
I have a jabeo dct 8000
I really like the controler with the feeding Modus.
My sump is in my living room and the Sound is ok.
At first i had it plumbed like you and it was to loud.
Now its fine.
Ahhh now we come to the crux of the matter....she didn't want the tank in the first place!
Gut instinct tells me once the pump reaches 0.00 decibels, it will start to smell...or the electric bill will be too high.... or the humidity is making the roof bow.....
Just saying.