I took some pictures last night. I am not sure how much they will help though. Once visible thing is the bleach white area where the algae used to be. Since I do not have a before picture this is the only real indication.
You would otherwise have a hard time guessing I have algae issues. I took a macro shot to show how the algae is like "skin" on my rockwork.
I will try and get a few uploaded this evening.