Hey,
First of all it is good practise to place pink styro under your sump, and tank dude to the weight load and it tends to take pressure off corners and prevents warping and potential disaster. Some swear by it, Some swear you don't need it. Its really your decision. (I suggest you do) If your sump has a black frame around it then you would be okay without it.
As for overflow Herbies are by far the most quiet overflow I have ever ran on any system. Dead Silent! The trick is to have the valve on the main drain and fill the overflow to drain a small amount into your emergency drain. Also make sure your Main drain is far away enough from your Emergency drain so you don't cause suctioning.
You may find vibration noise from running returns up the back of your tank I would just try to minimize the amount the PVC is touching. Spa Flex is another option that may work for the return. I use it in my sump though I have my returns plumbed up through my overflow I don't have any vibration from my return.
This all being said my tank does have noise from powerheads and what not but after awhile you rarely notice the noise.
|