ENTANGLEMENT. :-(
Small Humpback with at least three crab pot floats and line, seen and reported today by Sanctuary and Blue Ocean Whale Watch. Last photo show the whale entanglement team arriving on the scene, ready for action. Please consider donating to this worthy cause, and doing what you can to encourage whale-safe crabbing.

Lengthy sequence of photos showing Cuthona perca eating a small, donut-shaped (piece of? or small individual?) Diadumene (possibly Diadumene fransicana?). I'm also curious whether the white bits (dropping from its mouth, stuck on the side of the anemone and a few on the substrate) are some part of the anemone it doesn't want to consume; perhaps nemtocysts? I have unimpressive video if that helps, but these photos are sharper. @jeffgoddard @tgosliner

Both C. perca slugs I found yesterday at Lake Merritt seemed to have some sort of evenly-spaced, stalked growths on all their surfaces, perhaps some sort of parasite, fungus, virus or ? The overall impression was "furry." The other one, which I brought over to the microscope (https://www.inaturalist.org/observations/240871810), also shows these growths and was photographed by @audreyfalconer1, @pacificplankton, @leslieh, @ktnoonan, @chilipossum and possibly others as well.

Water quality data:
Temp: 23.6 degrees C
SAL-ppt: 33.93
pH: 7.89
DO: 86.6 (top)

Update: those might be ciliates in genus Scyphida, according to Jeff Goddard (see comments below).