Could it be a caliume buildup as in to much ca as your pic kind of looks like a ca buildup or even anouther scailing type of substance. get the test results they will tell you more than we can guess at. You should not have to tare your tank down and re do it, if it is something realy bad and needs a host it will die off it may take some time Ie velevet take 3 months I believe. I don't know if there is anything else that take that long. You see you have to kill any eggs that are in there also.

I don't think at this point that it is any thing that bad, it realy looks like scailing of some type even ammonia will cause scailing if it is from the ammonia then scrape and sphifon at the same time. Ammonia scail will keep your tank levels high, I was up late last night thinking about your problem.
I did take anouther look at the eggs in my tank and your pic, no not eggs looks more like how coriline algea dose when it starts but with no color to it.

See when your over tired and you are thinking about something you can be pulled back to your original thought and be wrong. Not eggs...

Bill