Algae Removal question

[gregzz4]

I found in my battle that removing the causative issues wasn't enough. IMHO, once the algae has a foothold it'll trap the nutrients underneath itself and you have to remove the algae plus the nutrients it's trapped beneath it.
Removing the nutrients from the water column isn't enough as the algae will feed itself on the trapped nutrients underneath, and will also keep trapping nutrients in it's own growth.