sps acropora algae pulsating xenia

I have a 29 gallon standard that has been running since 11/13/21 and I've had no growth of any coral at all. My parameters seem to be okay Mag :1260 Calcium: 500 Nitrate: ~5 PH: 8 KH: 11.3 Salinity: 1.023 Phosphate kit expired I run a Seachem tidal 35 HOB with matrix and Chempure GFO with an...

Hello, I don't know whether to iodine dip and blast that algae off the center of this acropora or not. In fact I've never seen anything like this. Your ideas will be much appreciated. Also let me know if you have any idea as to why this stupid pulsating xenia won't open up. Water parameters...