  Recently, we have uncovered Hidden Cooling Flows (HCF) in the X-ray spectra
of the central Brightest Galaxies of 11 clusters, 1 group and 2 elliptical
galaxies. Here we report such flows in a further 15 objects, consisting of 8
clusters, 3 groups, 3 ellipticals and 1 Red Nugget. The mass cooling rates are
about 1 Msun/yr in the ellipticals, 2 to 20 Msun/yr in the groups and 20 to 100
Msun/yr in regular clusters. The Red Nugget, MRK1216, has an HCF of 10 Msun/yr.
We review the fate of the cooled gas and investigate how some of it might
accrete onto the central black hole. The gas is likely to be very cold and to
have fragmented into low mass stars and smaller objects before being swallowed
whole, with little luminous output. If such a scenario is correct and operates
at a few Msun/yr then such objects may host the fastest growing black holes in
the low redshift Universe. We briefly discuss the relevance of HCF to the
growth of early galaxies and black holes.
