fungia not oppening

[Ninic Luka]

i have fungia coral for few weeks now it opened once i dont know that's going on. my parameters are ca 420 mg 1440 kh 8.6 no3 30 po4 0.05 all corals including acros elegances hammers montis are growing good and have amazing colour. he is on samd bed and in low flow area im using 5x39w t5 blubs on 65g tank. there is no fish picking at it or anything like that

 

[Dkmoo]

If they inflate at night then you have it with too much light during the day

 

[Ninic Luka]

If they inflate at night then you have it with too much light during the day

it doesnt