pavona in distress?

[vames]

I've had this pavona for about 5 months, and it has grown well and seemed reallly healthy. Yesterday, it started extending some long sweepers, which I'd never seen it do before. My BTA recently went for a walk and settled a little too close (maybe?) so I suspect it might be related to this. Anyway, here are two quick (not great, sorry) pics. The long sweepers on the left of the coral are what I'm referring to. Is this a sign of distress? Or am I worrying too much?

Just tested everything yesterday...
Ca: 420
Alk: 11dkh
Phos: 0-0.5 (darn API kits...I can't tell those dang colors)
NO3: 0
Temp: 79.0
Salinity: 1.026
Mag: 1380

pic #1

pic #2