They have in the tank for about 5 weeks. From the beginning they were voracious eaters but, as I mentioned, they went through a very stressful period when some of my fish died including 2 angels. This happened due to a double dose of Flourish Excel, I believe.

Their stomachs are bulging symmetrically.
They are behaving normally except for the newly acquired shyness and eating problem.
The other fish in the tank: cardinal tetras, corys, otos, plecos.