I spent 3 hours or so rinsing sand. First with cold tap water and then a last rinse in RODI.
This was the view as I was dredging the sand out:
This is how it looked IMMEDIATELY after the sand was back in. To my surprise, underneath the GHA, the chaeto in the in-tank refugium looked healthy so I put it back in. I have it tumbling in there now, but unforunately it keeps getting blown out of the slits in it. I need to glue some mesh in there.
This was the view as I was dredging the sand out:
This is how it looked IMMEDIATELY after the sand was back in. To my surprise, underneath the GHA, the chaeto in the in-tank refugium looked healthy so I put it back in. I have it tumbling in there now, but unforunately it keeps getting blown out of the slits in it. I need to glue some mesh in there.