Trouble With Platinum Angels

Hi

Is it just me are the Angels on sale recently getting weaker.

Have had a number of these recently and they seem very weak. All the dark and multicolours seem to do fine but these guys have not done well for about 2 years, to the point I am thinking of givng up on them. Trouble is they give that certain sparkle that is not there from any other fish I can think of.

Just wondered if anyone else had the same experience.

Thanks.