Looks pretty good.
Just a few exceptions, the identification of the polymer in ecoBAK and ecoBAK PLUS (polymers) has not been publicly released. The nature of the polymers and their formulation was covered in our patent application but not publicly. So stating that all bio pellets are PHB/PHBV is not correct.
Other than that, looks great. In addition, the bio pellets themselves don't feed Cyanobacteria. The Polymer is insoluble in water so it's not like Vodka or Vinegar that are in the water stream to feed the Cyanobacteria. What happens is that the bacterial biomass forming on the surface of the pellets can be sheared off by water flow and it can settle out into the substrate of a system. From there it can break down and re-release NO3 and PO4 into the water stream.
And regarding nutrients being too low for some coral types, I recommend to feed more. A well fed reef is a happy reef.