Quick update...did some serious (and overdue) work on the tank last night. Also discovered that I am once again in possession of yellow BN fry (free-swimming).
I felt bad though - I made the mistake of picking up the rock underneath which they were hiding, and the angels, keyholes, and bolivian ram went nuts. I put the rock back down before too many were picked off, but I still felt for those that became food.
I'm considering a breeding net. Does anyone know how well these guys are likely to survive without parenting?