condylactis anemone help

[tannerc407]

hi I am in the beginning stages of setting up a reef aquarium, I have a Fluval evo 13.5 gallon, I added a condy anemone about 2-3 weeks ago can't exactly remember and it was doing great always fully inflated and extended up until maybe 3-4 days ago it now stays almost fully curled into himself i know that typically they may close up at night but even with the lights fully on he barely extends? here are my parameters and livestock ps the tank is about a month old now but before you are quick to blame that i had live sand live rock live bio-filtration and have been doing about .5-1 gallon water change daily, and feed every other day
ammonia- undetectable
nitrite undetectable
nitrate 0.3 ppm
ph 8.1
temp 76

live stock-
1 condy
1 ocellaris clown
1 citron goby
2 margarita snails
1hermit
1 small brittle star.

any idea why he's curled up should i be worried? thanks for any help!!