Substrate that doesn't cloud the water?

[sumpfinfishe]

Andy:
I think the point that Invigor was trying to make was that if you add new sand to your existing bed you may want to use a tube of some sort to transfer the sand down to the bottom of the tank. It's an old trick to keep the new sand from stiring up, just use a pvc pipe or some wide diameter tubing and feed the new sand in at the top, the sand will flow down the tube and you can direct it where you want it with out a huge sandstorm.

As for the clouding by your wrasse well Rikko and G1GY covered that quite well. You are not going to be able to stop the wrasse from digging, so having a storm of sand here and there is something your gonna have to live with-unless you get rid of the fish. I have two yellow watchmen gobies that are alway's digging and stiring up the sand, and with the high flow in my tank it gets blown pretty much everywhere, but eventually it settles.

I also hope that you washed all your sand(not the live variety) before adding it to your tank. If not, this could be a reason why it's so cloudy!
When adding new dry sand to a setup, I alway's let it rinse in a bucket in the bath tube or with a garden hose outside until the water runs clear even after it's be slightly stirred.