Good points. I put the CC in ~4 years ago and they have always been very good participants in the hand feeding. Actually running the HBG off as they scoop up the feed on the surface. So, 1 - They are not visible and not coming to the nightly feeding party and 2 - I went down with the ole hook and worm today and let it soak in 3 different spots, no bites. If there's any silver lining, when I first put the pond in, I didn't have a break in the outlet and the neighbor's pond to the south allowed some BHs to swim upstream during a 5" rain. So, I've been dealing with them also. Now, it appears that what ever took the slick skins out, took all the CC and the BHs, but left the LMB and HBG. I will miss the couple of albino CC I had in there. thanks again guys.
