humBill wrote:

Some comets seem to be missing some scales. In some cases it's just one or
two here, a couple more there, maybe 10 total at random. In others there is
more missing and will sometimes look like a wide scratch or abrasion. Most
recently I just noticed one who has what appears to be a large scrape right
on his forehead (all the others are on their sides).

I agree with the others, it's spawning activity. I watched it with my
fish and took pics. (Of course, I got a ration from forum ppl...). I
added some pond salt at a 1% level to ease and speed the healing.

Wetbug