After a few days in my tank, my gold torch lightened in color, turning to a pastel yellow. Other than that it appeared healthy. After four-five months, it suddenly reverted back to its rich, golden color. I have no idea why it lost its color... low nutrients perhaps. With the cyano on your sand bed, I suspect you have some nutrients that will help your torch regain its color. Also, I find that unhealthy torches recede at the base first, just below the head. Your torch has a healthy amount of flesh below the heads, so it looks good to me.