Why? Corals changing colors

Hey everybody.....I did a water change and treated for Zoa pox last week.The pox is about gone , but my Montiporas,mushrooms and palys are changing colors, seem to be a lighter brighter color.The little plate coral changed to a pale light aqua color too.The palys have shorted up too.They are shorter then before.Any ideas?? I cheked the parameters and all are fine.I replaced the tubes(actinic and daylight) a couple of weeks ago.Would that do this too?Syphonogorgia is feeding better now, galaxia is shrunk down like when I got it??

 

They seem better today but still pale.Like a color shift.