I don't see anything wrong with picking up a downward spiral piece of coral, to try to revive it. A lot of times at a localLFS, i try to do that, with the corals they carry,,either they are not caring for it properly,,or it's going downhill, and tell them i'd take it (or they oughta frag it , to try to save it) and see if i could bring it back around,,,hardly ever works , at least for me, tho a buddy of mine, who now is a ex reefer , had better luck talking them out of the poor condition coral,,he even brought back frags grown from some of the stuff he got, and told the place, he will take them back, it they show signs of crapping out again.
I think you prob have a good chance on bringing those corals back , to a certain extent,,,I have a Favia, that was in pretty bad shape when i got it, it came back a great deal , tho it did not look like a perfect specimen now,,but it regrew it's base back , over the skeleton that was showing on most of it's body,,,not perfect, but at least hanging in there,,,,
Good luck with your new things, hope they come back real good for you!
