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I can see the video, it looks like you described, unfortunately its probably going to get worse before it gets better, standard new tank/dry substrate issues.. you probably don't need to do waterchanges on a 2 month old tank unless you didn't cure the rock and sand. I'd bet your n03/p04 are out of balance.having issues with cyano, i do weekly water changes to. tanks about 2 months old now and had dry rock to start it.
I wouldn't trust the measurements of those tests. Have LFS test for you if they use something different. Get yourself some salifert tests instead. Better testing is necessary if you want coral to thrive and a healthy tank.phosphates are 0 but looks like the nitrates are a little elevated .