Zoanthids are fat and have mouth exposed?

AwildcatsZ

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I have a frag of two WWC salted agave zoanthids that have been acting funny over the last three days. Their stalks have gotten very puffy and they seem to be pushing their mouths out, or keep closed. Here is a picture from tonight:
4ef58f163bd6890705b2223b71fb73df.jpg

They have been in my tank for almost 2 months now and have even started to grow a couple of babies. Typically they are very open and look amazing:
9efbe89cf4caec33d0ff68e0c1d2b82e.jpg

This is a new behavior and I was hoping someone knew what was going on. Everything else in the tank is open and healthy. Tank parameters are:

29 gallon
Temp: 77/78
Salinity: 1.026
pH: 7.8
Nitrates: 5ppm
Phosphates: .02
Alk: 9.8
Ca: 420
Mg: 1400

5 gallon waterchange every other weekend.
Reef Roids spot fed twice a week.

Please help! Thanks!
 

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