I added a couple more inches of oolite (sp?) sized live sand, very fine stuff, which I got off eBay. The seller suggested that it wouldn't need to be washed, and probably shouldn't be. I took his word.
Took overnight for the water to clear up (even though I was extreeeeeemly careful adding it).
Now every time a fish bumps the sand, which they do from time to time, I get a milky cloud (not sand) of what looks like silt, mushrooming up into the water column. Clearly, the sand isn't the cleanest sand in the world. From the front glass it does look good, very fine sand, but obviously there's a lot of silt in it too.
I added a berlin sock to my overflow to catch what's getting stirred up.
I don't want to be dealing with this ad infinitum, so are there any suggestions to clean some of the silt out of this sand?
Or do I even want to clean it - is the silt (I'm guessing that's what it is) a problem, or is it good for a DSB