Small QT tanks, such as 10 gallon tanks, are usually intended for 1 or maybe 2 small fish. Angels, rams, torpedo's and celebres rainbows is way too much for a 10 gallon tank. Even with adequate hiding spots, you are not giving the fish room to move.
IMO, I would not keep in the fish in there for more than a day. If there are any other fish in the main tank, I would remove them all and place them in another tank or maybe just a put full of used tank water. Once all the fish have been removed, you can probably safely perform a very large WC (75% or more). Add water back with the proper dechlorinator and let the water settle for a few hours, until the temp sets. Then slowly acclimate the fish back into the main tank.