Hmm, so you guys vote against a partial sand bed removal. I was hoping that it was as easy as that, haha, although I doubted that myself actually.
I disturbed the sand bed a bit, moving large boulders on the bottom of my tank to get to hiding fish. A lot of detritus settled on the sand bed afterward. I believe that my sand bed critters and I cleaned up most of the detritus settled on the surface since then.
Despite the cyano issue, I got my rose milli and an unknown acropora (A. tenuis look-alike) to brighten up after all by bringing the light down so they are as close to light as they were before. This seems to indicate (at least to me) that my water quality is not bad at all after all. However, my large baby blue acropora with white polyps is still determined to stay brownish
Tim -
A lot of people use filter socks and they love them. I never used filter socks before because of the fear of trapping copepods. I use GAC regularly. This time I had them both. A number of SPS keepers blow detritus off the rocks during a water change and capture the fine particles with the filter socks for the next day or two. That was my plan, but it got away from me due to the busy schedule.
There were some amphipods on the socks, but they came off when I shook the socks repeatedly in a bucket of tank water.
As for cleaning the filter socks, I washed it in my washing machine in hot water without any detergent and it came out very clean.
Tomoko