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And yes that is exactly what I said ... even if your test reads zero, there still is PO4 in the tan (inorganic) and your test does not measure organic phosphate that is also in the tank. Not even the colorimeter you use. And of course all life forms including ourselves need P or we would not...

Not sure what year that article is from but the recommended level with a low range test is 0.00 ppm and if you use a Salifert test below 0.03 ppm will show as 0.00 ppm but that does not mean that there is no phosphate it is just that is is so low that your test cannot detect it and that is good...

Salifert low range test kits and the level you get should be 0.003 ppm or lower meaning on that test kit it will shoe zero. If your PO4 is too high, run GFO or Aluminum oxide to reduce it to non detectable levels FWIW

I added a Yellow Rose one to the tank and all is fine ... no issue between the Blenny and the Gobies. Thinking about adding another Goby (small) but have not decided which one yet (and a commensal shrimp).

Blennies and Gobies should get along IME ... I have both in my 20 Gallon high and the only bit of aggressiveness I see is not between the Blenny and the Goby (one of each) but between the Blenny Bi-color and my Lantern Basslet, although it never gets out of hand, they just play as if there was...

Could be an anemone crab but to be sure a picture would help or do a search and find a picture so you can compare Albert