SPS color question

[Chowder]

It is common for acro pieces to loose colour when they are introduced to a different system. Alot of the time when I get a new piece that is coloured up they will brown out then colour back up in time and not always the same colouring. I have also noticed complete colour changes from one tank to the other. The reason I suggest this is because you stated your other pieces are doing well and these sound like they are fairly new to your system. What do you use for flow?
Chris