the thing with checking po4 is that the algae is using it up so fast in the tank your test kit wont catch it. i would test all water being used for the tank and see what you have there. hopefully its a new tank syndrome and should reside but syphon as much of it as you can. arent the tangs eating it. the 2nd pic is i believe dictoya which can be a major PITA. how often are you feeding? do you use RO for changes and top off? what type of food are you giving? how much are you skimming a day?
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