[fishytime]

Originally Posted by Madreefer

I'd be adding that live rock as soon as you can to start it cycling so you can start adding all the cool stuff. You can also shorten your pcv pipe by an inch or so which will make it so your pump is not touching the bottom or side of your sump. That will stop the humming or rattling sound. Just make sure that the pcv is anchored or supported somehow so the weight of your pump is not putting any stress on your plumbing. But putting rubber on the bottom of your pump is just going to dampen the sound and really should'nt hurt your water parameters. Anything food safe will be good.

+1.....if you've got water(salted) in the tank and are happy with how the return and drains are functioning (aside from the noise(that will just take some tweaking)).....then get your rock in there Girly!......the rock doesnt care how cloudy the water is......might as well get the cycle started......

I cant remember if your return lines are over the top or if they are drilled???....if they are drilled, then I wouldnt "suspend" the return pump.....the pump vibration coupled with the weight of the pump and plumbing hanging from it could over time cause the bulkhead hole to fail and crack....best and easiest to go with a piece of dampening foam or rubber under the pump imho....