For those who have used Cutrine-Plus, will the dead algae sink to the bottom or does it need to be racked out?
Ideally, one would rake out (or otherwise physically remove) as much FA as possible before treating - if so inclined - and relocate it (after it dries out) beyond the pond's watershed - and then treat any remaining patches of FA with Cutrine. By using this approach, the nutrients bound within the algae are removed from the pond - and the need for and usage of CUTRINE is reduced. That's a win-win scenario.
In your present situation, physically removing the dead algae at this point will accomplish only one of the mentioned benefits. However, if you leave it undisturbed, it will eventually sink once the FA's bouyancy-inducing bubbles become dislodged; at which point, the release of nutrients from the decomposing algae will likely spawn a new generation of FA from ever-present spores.
