polyp extension

[24storm]

What causes polyp extension in SPS? I have pieces that are right beside each other in the same flow. One will have great extension and the other not so good.
It is not always the same corals sometimes some will retract the polyps for days then come back. Do i need more flow? I have 2 Tunze 6100 and a Tunze wavebox in a 220 6 foot tank.

Any advice would be appreciated.

Thanks Keith

[Myka]

Your guess is as good as mine...stupid LPS. LOL! Mine do it too...

[Snappy]

You likely have a fish that nips at them occasionally. How is the PE at night after lights out?

[24storm]

I think things are the same with the lights on or off. But i will take a closer look over the next few nights.
What are you thinking?

[PzReefer]

I get great PE on all acro's at night (so beautiful when extended that far).:biggrin:
During light hours I get much less on most of my SPS except monti's extend more during the day.

[marie]

I have a regal angel that nips my sps so the polyps only really extend at night