tricks to keeping Superman Paly colors?

[therman]

Anyone out there have "superman paly" type morphs that are able to keep their colors? The whitish blue in the center fades out on me until I get a whitish haze on a brown paly, with little red highlights on a brown skirt...

I've tried low light, high light, feeding, etc. and nothing seems to make a difference.

 

[impur]

Mine are superman zoas, not palys, but i have them in medium light and high flow. They grow like crazy.

These the ones?