Not at all. Simply slow the flow way down (temporarily), and add the new
stuff as carefully as you can to avoid stirring up too much. Let it settle
down on its own. It will clear in a couple of days with no ill affects. It
looks worse than it is.

Depending on the substrate, you don't need to rinse much. I use aragonite
sand, and the fine particles are what you want to keep, not rinse away.
When the bacteria starts to attach to the particles, they settle out fast.

"Tre' Landrum" wrote in message
newsPYId.994$G31.535@okepread05...
Just as an aside what if one needed to add more substrate to an
established tank? Rinse the begeezers out of it, add a few filters, and
pray for the best?

Tre'

"Kellbot" wrote in message
oups.com...
Mine clouded too, almost to the point where I couldn't see in the tank
at all. I just let my filter run for a few days, rinsing out the pad a
few times, and it cleared up quickly.
It'll also settle to the bottom, and you'll notice clouds of crud
coming out when you do water changes.